The Disciple of Vess

Whenever The Disciple of Vess attacks, you may put a planeswalker card from your hand onto the battlefield. If you don't, create a token that's a copy of a Liliana planeswalker chosen at random.
(There are currently thirteen. Perhaps look up the list and roll a D20?)

Welcome to Mini-apolis

Whenever an opponent casts a creature spell, create a token that's a copy of it, except it's 1/1.

Halana and Alena and Gisa and Geralf

First strike, reach
At the beginning of combat on your turn, mill four cards. You may choose a creature card from among them and cast it. When you do, it gains haste, becomes a Zombie in addition to its other types, and enters the battlefield with X +1/+1 counters on it, where X is Halana and Alena and Gisa and Geralf's power.

Backsies

Until end of turn, treat all counters as -1/-1 counters.
Fuse (You may cast one or both halves of this card from your hand.)

Takesies

Move up to one counter from each permanent onto target permanent.
Fuse (You may cast one or both halves of this card from your hand.)

Takesies // Backsies

Questing Cosplayer

When Questing Cosplayer enters the battlefield, create a Questing Role token and attach it to target creature. (If you control another Role on it, put that one into the graveyard. Enchanted creature has all the abilities of Questing Beast.)

Sixth Stage of Magic Design

All creatures are legendary.
Creatures with a black or silver expansion symbol get +1/+1.
Creatures without a black or silver expansion symbol get +2/+2.

The Joiner of Cats

Whenever this creature attacks, look at the top six cards of your library. You may put a Cat creature card from among them onto the battlefield tapped and attacking. Put the rest of the cards on the bottom of your library in a random order. If you don't put a card onto the battlefield this way, create a token that's a tapped and attacking copy of Lurrus of the Dream-Den.

The Wiley Speedster

At the beginning of combat on your turn, choose one —
• Target creature gets +1/+0 and gains haste until end of turn.
• The Wiley Speedster deals 1 damage to any target.
• Create a Treasure token.

The Caffeinated Runner

Whenever the The Caffeinated Runner enters or attacks, create a Food token.
Sacrifice a Food: Target creature gains haste until end of turn. Whenever it next becomes tapped this turn, untap it.
Ready to run (You can have two commanders if both have ready to run.)

Taught by Narset

Commander enchantment (This aura enchants a commander creature, and remains attached to the creature as it moves between any face-up zones. You can cast it on a Commander in your command zone.)
When you cast Taught by Narset, draw a card.
Enchanted creature has prowess and ward {2}.

The Paradise Bird

Flying
Other Birds you control get +1/+1.
{G}, {T}: Create a Birds of Paradise token.
If The Paradise Bird is your commander, your deck can include cards of any color identity.

Kamigawa Charm

Choose one —
• Dosan's Oldest Chant (Gain 6 life, draw a card.)
• Kodama's Reach (Search for two basic lands, put one onto the battlefield tapped and one to hand.)
• Time of Need (Search for a legend.)

Forestfolk

When Forestfolk enters the battlefield, you may search your library for a basic land card, put it onto the battlefield tapped, then shuffle.
When Forestfolk leaves the battlefield, draw a card.

Interrogation Robot

{T}, Discard a card: Choose a card name that hasn't been chosen among Who, What, When, Where, and Why. Create a copy of the card with the chosen name. You may cast the copy. (You still pay its costs. Who//What//When//Where//Why is a split card from Unhinged.)

Identify the Culprit

Secretly chose a creature target opponent controls. Then, that player guesses which creature it is. Reveal the chosen creature. If they guessed incorrectly, exile the creature you chose. Otherwise, return Identify the Culprit to its owner's hand and you can't cast it again this turn.

Second Stage of Magic Design

Whenever you cast a spell with a keyword or ability word, if it doesn't share a keyword or ability word with a permanent you control or a card in your graveyard, draw a card. (Keywords and ability words include abilities like flying, flashback, and landfall.)

Hosting Season

While it's October 25th, 2024, whenever you cast your commander, create a token that's a copy of it except it isn't legendary.
While it's October 26th or 27th, 2024, if one or more tokens would be created under your control, instead twice that many tokens are created and each of them enters with a +1/+1 counter on it.
On any other date, both abilities apply. (Because why not?)

Trash Panda

When Trash Panda enters the battlefield, exile target opponent's graveyard. Create a Food token for each creature card exiled this way.
When Trash Panda dies, put it into target opponent's graveyard.
Opponent dredge 4 (If an opponent would draw a card, instead you may have them mill exactly four cards and put this card into their hand from their graveyard.)

Command Power Plant

{T}: Add one mana of any color in your commander's color identity. If you control a Command Tower and a Command Mine, add two mana of any color in your commander's color identity instead.
Command Towers you control have, "{T}: If you control a Command Mine and a Command Power Plant, add three mana of any color in your commander's color identity."

Arvad of the Weatherlight

Rulebreaker — If Arvad of the Weatherlight is your Commander, you may include legendary permanents of any color in your deck regardless of color identity.
Whenever Arvad deals combat damage to an opponent, you may put a legendary permanent card from your hand onto the battlefield.

Who's That Praetor?

Choose one at random. Create a token that's a copy of the chosen card.
• Elesh Norn, Mother of Machines
• Jin-Gitaxias, Progress Tyrant
• Sheoldred, the Apocalypse
• Urabrask, Heretic Praetor
• Vorinclex, Monstrous Raider
• Ebon Praetor

Mysterious Confluence

Choose a card at random from among Righteous Confluence, Mystic Confluence, Wretched Confluence, Fiery Confluence, Verdant Confluence, Brokers Confluence, Cabaretti Confluence, Maestros Confluence, Obscura Confluence, and Riveteers Confluence. Create a copy of that card. You may cast the copy without paying its mana cost. (Roll a D10 to determine the random card.)

Force of Rowan

You may pay 1 life and exile a red card from your hand rather than pay this spell's mana cost.
Copy target instant or sorcery spell. You may choose new targets for the copy.

The Magical City, New

The The Magical City, New enters the battlefield tapped.
{T}: Add {W}, {U}, or {R}. When this mana is spent to cast a legendary spell, put a +1/+1 counter on this land.
{4}: The Magical City, New becomes a 1/1 white, blue, and red Human Artist creature until end of turn.
The Magical City, New can be your Commander. (Commander tax still applies.)

Leisure Bicycle

Whenever Leisure Bicycle attacks, target creature that crewed it this turn explores.
Crew 1
Cycling {2}

The Fearsome Flock

Flying, split second level up {2}{U} ({2}{U}: Put a level counter on this. Level up only as a sorcery. This can't be responded to.)
LEVEL 1-3
3/3
Flying
Whenever The Fearsome Flock deals combat damage to a player, gain control of target noncreature artifact that player controls. It becomes a Treasure.
LEVEL 4+
3/4
Flying
You may activate abilities of artifacts your opponents control as though you control them.

Chatterstorm and Awaken the Woods

Create a 1/1 green Forest Dryad Squirrel land creature token. (It's affected by summoning sickness.)
Storm (When you cast this spell, copy it for each spell cast before it this turn.)

Genevieve, Conniving Dragon

Flying
At the beginning of combat on your turn, roll the party die and create a number of Treasure tokens equal to the result. (Your party consists of up to one of each of Cleric, Rogue, Warrior, and Wizard. If your party size is 1, the party die is a d4. It's a d8 for 2, a d12 for 3, and a d20 for 4.)

Ulgrotha Charm

Choose one —
• Merchant Scroll (Search for a blue instant.)
• Memory Lapse (Counter a spell and put it on top of its owner's library.)
• Forget (Target player discards 2, then draws that many.)

Banned Eldraine Card

As an additional cost to play Banned Eldraine Card, pay {B}, {3}{R}{G}, {3}{R}, {2}, {0}, or {1}{G}. It becomes a copy respectively of Cauldron Familiar, Escape to the Wilds, Fires of Invention, Lucky Clover, Mystic Sanctuary, Once Upon A Time for the rest of the game in all zones. (You can't choose Oko. Because let's be real, nobody wants to play against Oko again.)

Black Tulip

{T}, Exile Black Tulip: Add three mana of any one color. You can't activate this ability until you've begun your sixth turn of the game. (Keep track if this is in your deck!)

Grek the Ogre

Grek gets +1/+1 for each differently named token among permanents you control.
Whenever Grek attacks, create one of the following at random you don't already control: a 1/1 green Donkey creature token, a 2/2 white Cat creature token, a 3/3 green Ogre Noble token, a Swamp token, a Food token, or a Gold token.

The Fish Brewer

When The Fish Brewer enters the battlefield or attacks, create a 1/1 Fish creature token that's all colors.
If another permanent entering the battlefield causes a triggered ability of a permanent you control to trigger, tap any number of Fish you control. That ability triggers an additional time for each Fish tapped this way.

The Actualizer

At the beginning of your first main phase, read aloud the name, mana cost, type line, power, and toughness of a card in your hand, except lie about one of them. Each opponent simultaneously guesses which one is incorrect. Then reveal the card. Each opponent who guessed incorrectly loses 3 life. You may discard that card and draw a card. (They can't look it up or ask for help as this ability is resolving. Nice try, though.)

Sharp Eraser

{2}, {T}: Reveal cards from the top of your library until you reveal a nonland card. You may erase any number of words on the card, including flavor text, as long as the card still makes sense. Then cast the revised card without paying its mana cost. Put all other cards revealed this way on the bottom of your library in a random order.

Fourth Stage of Magic Design

Once per turn, you may cast a nonland card as though it was another card of your choice with the same mana cost. You can't choose the same card twice. (Mana cost includes color. No looking cards up!)

The Majestic Duo

When The Majestic Duo enters, if you don't control another permanent named The Majestic Duo, create a token that's a copy of it, except it's not legendary, it has "Whenever this creature deals combat damage to a player, draw a card and earnestly tell them good luck," and it loses all other abilities.
Whenever this creature deals combat damage to a player, you and that player may each put a permanent card from your hand onto the battlefield. Offer them a high-five.

Drive to Work

Exile target creature or Vehicle. At the beginning of the next end step, return that card to the battlefield under its owner's control. Then you may share a story or fun fact about that card. If you do, you gain 3 life.

The Crab Queen

Whenever The Crab Queen attacks, create a token that's a copy of one of the following at random: Skitter Eel; Skittering Crustacean; Ruin Crab; Charix, the Raging Isle; Scuttletide; or Heartstone.

Your Mana Rock

Your Mana Rock enters the battlefield tapped.
During deckbuilding, write two different colors on Your Mana Rock.
{T}: Add one mana of a color written on Your Mana Rock.

The Magic Bandit

When The Magic Bandit deals combat damage to an opponent, exile the top card of that player's library. You may cast that card for as long as it remains exiled, and mana of any type can be spent to cast that spell.
Whenever you cast a spell or play a land you don't own, copy it.

Locus Cobra

Landfall — Whenever a land enters the battlefield under your control, add one mana of any color. If it was a Locus or Sphere land, put a +1/+1 counter on Locus Cobra.

The Wheeling Runner

You may spend any type of mana to cast cards that didn't start in your deck.
Whenever The Wheeling Runner deals combat damage to a player, you may discard your hand. If you do, choose four Vintage-legal cards at random. Add those cards to your hand. (The "Random Card" feature on a search site may help.)
Ready to run (You can have two commanders if both have ready to run.)

Plains

The Cosplayzer

You may have The Cosplayzer enter as a copy of any creature on the battlefield, except it has "The first time each turn an ability of this creature is activated or triggered, copy it. You may choose new targets for the copy" and the first letter of its name is Z. (This is both stylish AND makes it a different name for the legend rule!)

Command Mine

{T}: Add one mana of any color in your commander's color identity. If you control a Command Tower and a Command Power Plant, add two mana of any color in your commander's color identity instead.

Investi-Gate

Name two Ravnica Guilds. Create two copies that are copies of their gates. (Ravnica guildgates are lands that enter the battlefield tapped and tap for the two colors of the guild.)
Investigate.

Seventh Stage of Magic Design

Double all your spells and abilities. (All spells and abilities cast, activated, or triggered by you are copied. Mana abilities produce twice as much mana.)

The Great Juggernaut

At the beginning of your upkeep, sacrifice The Great Juggernaut unless you discard a card.
Whenever The Great Juggernaut attacks, shuffle your library then exile the top card of your library. You may play that card without paying its mana cost this turn.

The Judge of Height

Trample
The Judge of Height gets +1/+0 for each creature on the battlefield that it's taller than. (A creature's height is equal to its toughness plus its mana value.)

Another Night in Vegas

At the beginning of your upkeep, choose one that hasn't been chosen —
• Wake Up! — Return target creature card from a graveyard to its owner's hand.
• VIP Line Access — Search your library for a card, then shuffle and put that card on top.
• Life of the Party — Whenever a spell is cast this turn, you gain 2 life.
• Breakfast at Dawn — Create two Food tokens. Sacrifice this enchantment.

Joven and Chandler

Backup 2 (When this creature enters the battlefield, put two +1/+1 counters on target creature. If that's another creature, it gains the following abilities until end of turn.)
Haste
Whenever this creature deals combat damage to an opponent, destroy target artifact that player controls.

First Stage of Magic Design

You gain 3 life. Draw three cards. Add {B}{B}{B}. This spell deals 3 damage to any target. Target creature gets +3/+3 until end of turn.

Stika, Playtestress

Whenever you cast a playtest card, draw a card. This ability triggers only once each turn.

Ring Out

Counter target noncreature spell.
Whenever an opponent casts a spell named Sol Ring, if Ring Out is in your library, you may search you library for Ring Out, and cast it without paying its mana cost targeting that Sol Ring, then shuffle.

Guildmark

Pledge (Join a two-colored guild if you haven't already this game.)
{T}: Add one mana of your guild's colors.

Clear, Fair Magic

Split second (As long as this spell is on the stack, players can't cast spells or activate abilities that aren't mana abilities.)
Destroy target artifact, enchantment, token, emblem, day/night tracker, monarch, initiative, dungeon, city's blessing, Attraction, Contraption, plane, scheme, vanguard, bounty, conspiracy, elite creature, or Magic: The Gathering Online avatar.

The Tokenator

Whenever The Tokenator attacks, you get two token counters. Then create a creature token with the color(s) and creature type of your choice. Its power and toughness are any combination equal to the number of token counters you have. (For example, if you have four token counters, it can be a 0/4, 1/3, 2/2, 3/1, or, if you're really sure, 4/0.)

The Alright Henge

{T}: Add {G}{G}.
Whenever a nontoken creature enters the battlefield under your control, put a +1/+1 counter on it.

Really Charming Prince

Flying
When Really Charming Prince enters the battlefield, choose one of the following four cards at random: Piracy Charm, Sapphire Charm, Trickery Charm, and Vision Charm. You may create a copy of the chosen card and cast that copy without paying its mana cost.

Guilded Lotus

Pledge (Join a two-colored guild if you haven't already this game.)
{T}: Add three mana in any combination of your guild's colors

The Unknown Wizard

Eminence — As long as The Unknown Wizard is in the command zone or on the battlefield, other playtest cards you cast cost {1} less to cast.
Whenever The Unknown Wizard enters or attacks, look at the top ten cards of your library. You may put a legendary playtest card from among them onto the battlefield. Put the rest on the bottom in a random order.

The Pleasant Taxer

As The Pleasant Taxer enters the battlefield, choose casting creature spells, casting noncreature spells, searching libraries, drawing a card beyond the first each turn, or activating abilities other than mana abilities.
Doing the chosen action costs players {1} more.

Rampant, Growth

Spell commander (This card can be your commander. In Limited, it can partner like other monocolored legends.)
Search your library for a basic land card, put that card onto the battlefield tapped, then shuffle.

Windmill Slam

Create a 4/4 Windmill artifact creature token with defender. When you do, it deals damage equal to its power to any target.
Miracle {0} (You may cast this card for its miracle cost when you draw it if it's the first card you drew this turn.)

You, Magic Playtester

{T}: Choose target playtest card. Increase or decrease a number of your choice on it by one for as long as it remains on the stack or battlefield.
{W}{U}{B}{R}{G}: Reveal the top 8 cards of your library. Put each playtest card among them into your hand, and the rest on the bottom of your library in a random order.

The Crimson Avenger

Flash
When The Crimson Avenger enters the battlefield, choose target spell an opponent controls. Reveal cards from the top of your library until you reveal a card that shares a mana value with it. Cast that card without paying its mana cost. Then shuffle your library.

Mana Conference

When Mana Conference enters the battlefield, each player secretly chooses a basic land type, then those choices are revealed. Mana Conference gains each basic land type that received at least one vote. (Basic land types are Plains, Island, Swamp, Mountain, and Forest.)

Primetime Suspect

Enchant creature
Whenever enchanted creature attacks, you may search your library for a land card, put that card onto the battlefield tapped, then shuffle. If enchanted creature is suspected, you search for two lands instead.

Taught by Surrak

Commander enchantment (This aura enchants a commander creature, and remains attached to the creature as it moves between any face-up zones. You can cast it on a Commander in your command zone.)
When you cast Taught by Surrak, draw a card.
Enchanted creature gets +2/+2 and gains haste.

The Cobra King

At the beginning of each player's upkeep, create a 1/1 blue Serpent creature token named Cobra Coil. When you do, if you control five or more Snakes and/or Serpents, choose one —
• Strike first — Target Snake or Serpent you control fights target creature an opponent controls.
• Strike hard — Put a +1/+1 counter on each Snake and Serpent you control.

Fate Reforged

I — (Bolas) Each opponent discards their hand. You draw seven cards.
I — (Ugin) Manifest your hand, then draw seven cards.
II — (Both) Create a token that's a copy of any Elder Dragon from the Legends expansion.
III — (Both) Exile Fate Reforged, then return it to the battlefield (Front face up).

The Battle of Dragon Brothers

(As a Siege enters, choose an opponent to protect it. You and others can attack it. When it's defeated, exile it, then cast it transformed.)
When The Battle of Dragon Brothers Enters, choose Bolas or Ugin.
• Bolas — Destroy all creatures.
• Ugin — Manifest the top three cards of your library.

The Battle of Dragon Brothers // Fate Reforged

Try-My-Deck Elemental

Flying
Commander spells you cast have demonstrate. (When you cast a commander spell, you may copy it. If you do, choose an opponent to also copy it. The copies become tokens.)
The "legend rule" doesn't apply to commanders you control.

The Zassacre Zirl

When The Zassacre Zirl enters the battlefield, if you cast them, destroy target commander an opponent controls. If its owner has two or more commanders, that card stops being a commander.
When another Commander dies, draw a card.

The Massive Zatcatl

Whenever you cast a creature spell, draw a card.
Tap three untapped creatures you control: Add {G}{G}{G}.

Magic Designer

When Magic Designer enters the battlefield, look at the top 10 cards of your library. You may reveal a playtest card from among them and put it into your hand, then put the rest on the bottom of your library in a random order.