You may have Sakashima enter as a copy of another creature you control, except it has Sakashima's other abilities. The "legend rule" doesn't apply to permanents you control. Partner (You can have two commanders if both have partner.)

Soulbond (You may pair this creature with another unpaired creature when either enters. They remain paired for as long as you control both of them.) As long as Deadeye Navigator is paired with another creature, each of those creatures has "{1}{U}: Exile this creature, then return it to the battlefield under your control."

Whenever this creature attacks, you may exile another target nontoken creature. If you do, this creature becomes a copy of that creature until end of turn. Return the exiled card to the battlefield under its owner's control at the beginning of the next end step.

Enchant creature When this Aura enters attached to a creature, each other nontoken creature you control becomes a copy of that creature. Nontoken creatures you control enter as a copy of enchanted creature.

Flying Whenever another nontoken creature you control dies, you may exile it. If you do, create a token that's a copy of that creature, except it's 1/1 and it's a Nightmare in addition to its other types.

If an artifact or creature entering causes a triggered ability of a permanent you control to trigger, that ability triggers an additional time.

Until end of turn, target creature gets +2/+0 and gains "When this creature dies, return it to the battlefield tapped under its owner's control and you create a Treasure token." (It's an artifact with "{T}, Sacrifice this token: Add one mana of any color.")

Equipped creature has haste and shroud. (It can't be the target of spells or abilities.) Equip {0}

All creatures get -4/-4 until end of turn. You become the monarch.

When this creature enters, return all other nonland permanents to their owners' hands. Unearth {6}{U} ({6}{U}: Return this card from your graveyard to the battlefield. It gains haste. Exile it at the beginning of the next end step or if it would leave the battlefield. Unearth only as a sorcery.)

When this creature enters, exile up to one target non-Salamander creature. That creature's controller creates a 4/3 blue Salamander Warrior creature token. Encore {4}{U}{U} ({4}{U}{U}, Exile this card from your graveyard: For each opponent, create a token copy that attacks that opponent this turn if able. They gain haste. Sacrifice them at the beginning of the next end step. Activate only as a sorcery.)

Destroy target nonartifact creature.

When this creature enters, exile another target creature or artifact until this creature leaves the battlefield. You may cast that card for as long as it remains exiled, and mana of any type can be spent to cast that spell.

Counter target noncreature spell.

Menace When this creature enters, you may destroy another target creature. If a creature is destroyed this way, you gain life equal to its toughness.

Counter target spell. At the beginning of your next upkeep, pay {3}{U}{U}. If you don't, you lose the game.

{T}: Add one mana of any color in your commander's color identity.

This artifact enters tapped. {T}: Add {B}.

{1}, {T}: Add {U}{B}.

{T}: Add one mana of any color that a land an opponent controls could produce.

{T}, Mill a card: Add {C}. (To mill a card, put the top card of your library into your graveyard.)

{T}: Add {C}. {1}, {T}, Sacrifice this artifact: Draw a card.

Flying {T}: Add one mana of any color.

{T}: Add {U}.

This artifact enters tapped. {T}: Add {U}.

When this creature enters, you may search your library for a basic land card, put that card onto the battlefield tapped, then shuffle. When this creature dies, you may draw a card.

As an additional cost to cast this spell, sacrifice an artifact or creature. Draw two cards and create a Treasure token. (It's an artifact with "{T}, Sacrifice this token: Add one mana of any color.")

Target player draws two cards. Flashback—{1}{U}, Pay 3 life. (You may cast this card from your graveyard for its flashback cost. Then exile it.)

Reveal the top five cards of your library. An opponent separates those cards into two piles. Put one pile into your hand and the other into your graveyard.

Deathtouch When Gonti enters, look at the top four cards of target opponent's library, exile one of them face down, then put the rest on the bottom of that library in a random order. You may cast that card for as long as it remains exiled, and mana of any type can be spent to cast that spell.

As an additional cost to cast this spell, sacrifice a creature. Draw two cards. If the sacrificed creature was legendary, draw three cards instead.

Flash If an opponent would draw a card except the first one they draw in each of their draw steps, instead that player skips that draw and you draw a card.

Target player draws two cards and loses 2 life.

Each other player discards a card. You draw a card for each card discarded this way.

Draw two cards. Then discard a card unless there are five or more mana values among cards in your graveyard.

Delve (Each card you exile from your graveyard while casting this spell pays for {1}.) Draw three cards.

{T}: Add {C}. Basic landcycling {1} ({1}, Discard this card: Search your library for a basic land card, reveal it, put it into your hand, then shuffle.)

This land enters tapped. When this land enters, exile target player's graveyard. {T}: Add {B}.

{T}: Add one mana of any color in your commander's color identity.

This land enters tapped unless you control two or fewer other lands. {T}: Add {U} or {B}.

This land enters tapped. When this land enters, return a land you control to its owner's hand. {T}: Add {U}{B}.

({T}: Add {U} or {B}.) This land enters tapped. Cycling {2} ({2}, Discard this card: Draw a card.)

({T}: Add {U}.)

({T}: Add {U} or {B}.) This land enters tapped unless you control two or more basic lands.

({T}: Add {B}.)

This land enters tapped. When this land enters, scry 1. (Look at the top card of your library. You may put that card on the bottom.) {T}: Add {U} or {B}.

{T}: Add {C}{C}. Activate only if you control five or more lands.

Return target creature card from your graveyard to the battlefield with a mannequin counter on it. For as long as that creature has a mannequin counter on it, it has "When this creature becomes the target of a spell or ability, sacrifice it."

Return target creature card from your graveyard to your hand. Threshold — Return that card from your graveyard to the battlefield instead if seven or more cards are in your graveyard.

Flash When this creature enters, you may cast target instant card from your graveyard without paying its mana cost. If that spell would be put into your graveyard, exile it instead.

You may have this creature enter as a copy of any creature on the battlefield.

You may have this creature enter as a copy of any creature on the battlefield, except it has "{U}{B}, {T}: Destroy target creature with the same name as this creature."

You may have this creature enter as a copy of any creature on the battlefield, except it has "{X}: This creature has base power and toughness X/X."

You may have this creature enter as a copy of any creature on the battlefield, except it's an Illusion in addition to its other types and it has "When this creature becomes the target of a spell or ability, sacrifice it."

Kicker {5} (You may pay an additional {5} as you cast this spell.) Create a token that's a copy of target creature. If this spell was kicked, create five of those tokens instead.

Flash Cascade (When you cast this spell, exile cards from the top of your library until you exile a nonland card that costs less. You may cast it without paying its mana cost. Put the exiled cards on the bottom in a random order.) You may have this creature enter as a copy of any permanent that entered this turn.

Ninjutsu {1}{U} ({1}{U}, Return an unblocked attacker you control to hand: Put this card onto the battlefield from your hand tapped and attacking.) You may have this creature enter as a copy of any creature on the battlefield, except it's a Ninja in addition to its other creature types.

This spell can't be copied. Choose one. If an opponent has eight or more cards in their graveyard, you may choose both instead. • Copy target spell. You may choose new targets for the copy. (A copy of a permanent spell becomes a token.) • Create a token that's a copy of target creature.

You may have this creature enter as a copy of any creature on the battlefield, except it enters with a shield counter on it if you control that creature. (If it would be dealt damage or destroyed, remove a shield counter from it instead.)

You may have this creature enter as a copy of any creature on the battlefield, except if this creature was embalmed, the token has no mana cost, it's white, and it's a Zombie in addition to its other types. Embalm {3}{U}{U}

Flying, deathtouch When this creature enters, draw a card.