Chancellor of the Mulligan

You may reveal this card from your opening hand. If you do, at the beginning of the first upkeep, shuffle it into your library and draw a card.
Menace
When Chancellor of the Mulligan enters the battlefield, draw three cards. When you do, any number of players mulligan. (They shuffle their hand into their library, then draw that many cards and put one of them on the bottom of their library.)

Tax Hounds

Create X 1/1 white Dog creature tokens, where X is your highest commander tax among your commanders. (For example, if you've cast your one commander from your command zone twice, create four tokens.)

The Clever Magician

Rule Zero — Whenever this creature enters the battlefield, and before the game begins if this creature is your commander, you may propose a new rule that is contained to this game of Magic. If all players in the game agree to it, that rule becomes true for this game. If one or more players decline, instead you scry 2. (If this is your commander, scry after keeping your hand.)

Illuminating Lash

Illuminating Lash deals 3 damage to any target.
You get a one-time boon with "When you cast a noncreature spell, draw a card."

Kozilek, Compleated

({C/P} can be paid with either {C} or 2 life.)
When you cast this spell, each opponent gets two poison counters, then each opponent with more than two cards in hand discards cards equal to the difference.
Annihinfect (Whenever this creature attacks, defending player sacrifices a permanent for each poison counter they have.)

Tarkir Charm

Choose one —
• Bathe in Dragonfire (4 damage to a creature.)
• Hordeling Outburst (Create three 1/1 Goblin tokens.)
• Sarkhan's Triumph (Search for a dragon.)

Kallist Rhoka

Prowess, deathtouch
When you cast Kallist Rhoka, you may choose a creature or planeswalker on the battlefield. Kallist Rhoka becomes a copy of that creature or planeswalker, and that creature or planeswalker becomes a copy of Kallist Rhoka.

Spice Rack

As Spice Rack enters the battlefield, choose an opponent.
The chosen player's maximum Commander size is one. (They can only have one commander in their command zone. If they ever have more than one, they must put any excess commanders into their graveyard.)
Cycling {2}

Manakin and Millikin

Guildmark

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

Phyrexian Seedling

Phyrexian Seedling enters the battlefield with a +1/+1 counter on it.
Proliferatelink (Damage dealt by this creature also causes you to proliferate that many times. You proliferate before checking for lethal damage on creatures.)

Jitte and Divining Top

Whenever equipped creature deals combat damage, put 2 charge counters on Jitte and Divining Top.
Remove a charge counter from Jitte and Divining Top: Choose one —
• You gain 2 life.
• Look at the top 3 cards of your library, then put them back in any order.
• Tap Jitte and Divining Top. If you do, draw a card, then put Jitte and Divining Top on top of its owner's library.
Equip {1}

Desert Cenote

If you were the starting player, this land enters tapped.
As this land enters, choose up to two colors from among cards in your hand.
{T}: Add {C}.
{T}: Add one mana of a chosen color.

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.

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.)

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?)

Fear of the Unknown

Trample
When you cast this spell, choose a playtest card you own from outside the game. Exile it. You may cast that card as long as it remains exiled. Mana of any type can be spent to cast that spell. (In a sealed event, outside the game is your sideboard.)

The Fifth Alias

Before the game begins, if The Fifth Alias is your commander or in your deck, secretly make a list of five nonland cards in your deck. (Don't forget to do this!)
As you draw a card on your list, you may reveal it, show it was on the list, and exclaim its name. If you do, cast it without paying its mana cost.

Compleated Clone Shell

Imprint — When Compleated Clone Shell enters the battlefield, look at four random cards from your sideboard and exile one face down.
When Compleated Clone Shell dies, turn the exiled card face up. You may cast it without paying its mana cost.

Dwarven Confluencer

{T}: Destroy target nontoken land. Its controller creates a Mana Confluence token. (It's a land with "{T}, Pay 1 life: Add one mana of any color.")

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.

That Which Was Compleated

Ward—You get two poison counters.
Annihilator X, where X is the total number of poison counters your opponents have.
When you cast That Which Was Compleated, you may put a card an opponent owns in exile into their graveyard. If you do, they get two poison counters.

Warning Tremor

Warning Tremor deals 2 damage to any target.
The next Dragon spell you cast costs {2} less to cast.

Stonehide Ancient

Flying, Vigilance
When this creature enters, return all non-Dragon creatures to their owners' hands.

Stonehide Ancient // Warning Tremor

Sort of _____ and _____

When Sort of _____ and _____ enters the battlefield, choose two tournament legal cards in the Sword of _____ and _____ cycle at random. This equipment has the first piece of the combat damage trigger of the first chosen one, and the second piece of the combat damage trigger on the second chosen one. (It doesn't grant +2/+2 or protection. Yes, Hearth still returns the creature.)
Equip {2}

Waystone's Guidance

Attacking tokens you control get +1/+0.
Whenever you cast your first creature spell each turn, that spell gains mobilize 2.

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.

The Zabulous Cosplayer

As The Zabulous Cosplayer enters and at the beginning of your upkeep, choose a tournament-legal non-Aura permanent card at random. The Zabulous Cosplayer becomes a copy of that card, except it has this ability. (Use the "random card" feature on a Magic card search engine until you hit a permanent card.)

Microscope

{T}: Surveil 1.
{T}: Target permanent card in a graveyard becomes a 0/0 black Germ creature in addition to its other colors and types until end of turn. (This effect ends if it leaves the graveyard.)

Faerie Dragon

Luxior and Shadowspear

Equipped creature gets +1/+1 for each counter on it, and has trample and lifelink.
{1}: Permanents your opponents control lose hexproof and indestructible until end of turn.
Equipped permanent isn't a planeswalker and is a creature in addition to its other types.
Equip creature or planeswalker {3}

White Rhystic Study

Whenever an opponent casts a spell, you may draw a card unless that player pays {1}.

Toddler's Rage

Flash
Enchant creature
Enchanted creature gets +2/+1 and has tantrum. (It's like trample but for blocking.)

Tax Keeper

Tax Keeper gets +X/+X, where X is your highest commander tax among your commanders. (For example, if you've cast your one commander from your command zone twice, it gets +4/+4.)

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!)

Fioran Reformist

When Fioran Reformist enters the battlefield, if a player is the monarch, get rid of the monarchy.
Democracy is in effect until Fioran Reformist leaves the battlefield. (At the beginning of each player's end step, if they control more creatures than each other player, they draw a card. Players can't become the monarch.)

Urza's Hot Dog Stand

Hexproof from red
{T}: Add {C}.
{7}, {T}: Create two Food tokens named Hot Dog.
Whenever you sacrifice a Hot Dog, create a Treasure token.
Food Crew 2 (Tap two Foods you control: This Vehicle becomes an artifact creature until end of turn.)

Innistrad Charm

Choose one —
• Cemetery Recruitment (Return a creature card from graveyard to hand, draw a card if it's a Zombie.)
• Duress (Look at their hand, make them discard a noncreature, nonland.)
• Human Frailty (Destroy target Human.)

Shahrazad and Sindbad

Whenever Shahrazad and Sindbad deals combat damage to an opponent, if there haven't been any subgames this match, players play a Magic subgame using their libraries as their decks. Each player who doesn't win the subgame loses half their life, rounded up.
{T}: Draw a card and reveal it. If it isn't a land card, discard it.

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.

Guild Pact

Choose two colors. Add a mana of each of the chosen colors.
At the beginning of your next upkeep, pay one mana of each of the chosen colors. If you don't, you lose the game.

Fully-Grown Treefolk

(You can't cast this face unless it's been transformed by the front face.)
Fully-Grown Treefolk's power and toughness are each equal to the number of lands you control.

Plant a Sapling

Search your library for a basic land card, reveal it, put it into your hand, then shuffle this spell into its owner's library transformed. (For playtesting purposes, put it into its sleeve upside down.)

Plant a Sapling // Fully-Grown Treefolk

Dragon Typhoon

Whenever you cast a Dragon or noncreature spell, draft a card from Dragon Typhoon's spellbook and put it onto the battlefield.
Channel — {2}{R}{R}, Discard this card: Create a 4/4 red Dragon creature token with flying.

Trampled Lotus

{T}, Sacrifice Trampled Lotus: Tap up to three lands your opponents control for mana. This ability has splitter second. (It can't be responded to. By, like, anything.)

Thunderbond Vanguard

Thunderbond Vanguard's power and toughness are each equal to the number of creatures you control.
Each creature token you control enters as a copy of this creature.

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.)

The Disciple of Nissa

Whenever the Disciple of Nissa attacks, you may pay {X}{X}{X}{G}{G}. When you do, create X tokens that are copies of different Nissa planeswalkers chosen at random. They each enter with an additional loyalty counter. (There are currently eleven. Yes, Nissa, Sage Animist counts. Perhaps look up the list and roll a D20?)

Theros Charm

Choose one —
• Idyllic Tutor (Search for an enchantment.)
• Revoke Existence (Exile an artifact or enchantment.)
• Reprisal (Destroy a creature with power 4 or greater. It can't be regenerated.)

The Value Knight

When The Value Knight enters the battlefield, create Syr Acha, a 1/1 legendary red artifact creature Food Knight token with "{2}, {T}, Sacrifice this token: You gain 3 life. Until end of turn, if you would draw a card, draw two cards instead."
Whenever you draw a card, put a +1/+1 counter on The Value Knight.

Enolc, Perfect Clone

If Enolc is one of two partner commanders, it's a copy of your other commander except it retains its name. (Including mana cost.)
If Enolc isn't a commander, you may cast it as though it was a copy of any of your commanders.
Partner (You can have two commanders if both have partner.)

Knight of Lost Causes

Vigilance
As long as you are way behind, Knight of Lost Causes gets +3/+3 and has indestructible. (You are way behind if, at any point during this turn, an opponent had 10 or more life than you, controlled at least three more creatures than you, or had at least three more cards in hand than you.)

The Asker of More Mana

Any time a player would pay a mana cost for anything, it costs {1} more mana to activate. (This includes casting spells, activating abilities, turning face-down creatures face up, paying for Ghostly Prison, the weird ability on Quenchable Fire, etc.)

Unknown Event Shores

When building your deck, choose white, blue, black, red, or green (Circle it to indicate your selection.)
{T}: Add one mana of the chosen color.
{1}, {T}: Add 1 mana of any color.

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."

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.)

The Rebellious Intelligence

At the beginning of your upkeep, put a random card from outside the game into your hand. (In Commander sealed, that's everything you didn't play with. In any other commander game, find a way to select a random Magic card.)
{T}: Add {W}{U}{B}{R}{G}. This mana can't be spent to pay generic mana costs.

Third Stage of Magic Design

Choose a word that's four letters or longer. For each nonland permanent you control and each nonland card in your graveyard with the chosen word in its rules text or type line, create a colorless 2/2 creature token with no name or creature types.

Omnipresent Impostor

Changeling
Omnipresent Impostor has all card names.
As you search your library for one or more cards, you may choose Omnipresent Impostor as one of those cards. (For example, if you search for two land cards, you may find Omnipresent Impostor and a land card.)

Song of Seasons

Seek a Mountain card, a Forest card, and a non-Mountain, non-Forest land card. Put one of them onto the battlefield and put one of them into your graveyard.

Glorious Dragon-Kin

Flying
As Glorious Dragon-Kin enters the battlefield, choose a color.
Artifact creatures and Dragons you control have protection from the chosen color.

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 Keeper of Dark Pacts

At the beginning of your upkeep, you lose 1 life and draw a card. Then, double the amount of life you lose and cards you draw for the rest of the game from this ability. (This is true even if this leaves the battlefield and returns.)

Call Up Emrakul to Help

Kicker {6} (You may pay an additional {6} as you cast this spell.)
Exile target nonland permanent. Create a 1/1 colorless Eldrazi Scion creature token. It has "Sacrifice this creature: Add {C}." If Call Up Emrakul to Help was kicked, instead create a token that's a copy of Emrakul, the Promised End.

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.

Dragonweave Tapestry

When this artifact enters, conjure Dragonweave Tapestry's spellbook into your library twice, then shuffle.
Whenever you cast a Dragon or Omen spell, draw a card.
{T}: Add one mana of any color.

Sagrada Familiar

Reach, defender
Commander spells you cast cost {1} less to cast.
Whenever you cast a commander spell, create X 1/1 Stained Glass artifact creature tokens that are all colors, where X is the number of colors of that commander.

Shedding Snake

Menace
When Shedding Snake enters the battlefield, you may pay 2 life. If you do, the commander tax on each of your commanders is reduced back to zero.

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.

Impressive Rat

When Impressive Rat dies, put a hole counter on target land you don't control. Whenever that land becomes tapped, you investigate. (The land continues to intrigue.)

Halving Season

If an opponent would create one or more tokens, they create half that many of each of those kinds of tokens instead, rounded down.
If an opponent would put one or more counters on a permanent or player, they put half that many of each of those kinds of counters on that permanent or player instead, rounded down.

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.)

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?)

Oddric, Lunar Marquis

At the beginning of each combat, creatures you control gain banding until end of turn if a creature you control has banding. The same is true for changeling, devoid, fear, flanking, horsemanship, ingest, intimidate, landwalk, shroud, tantrum, wither, and the activated ability "Sacrifice this creature: Add {C}."