Return target nonland permanent you don't control to its owner's hand. Overload {6}{U} (You may cast this spell for its overload cost. If you do, change "target" in its text to "each.")

Destroy all creatures. They can't be regenerated.

You may have Clever Impersonator enter the battlefield as a copy of any nonland permanent on the battlefield.

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

{2}: Mirage Mirror becomes a copy of target artifact, creature, enchantment, or land until end of turn.

({U/P} can be paid with either {U} or 2 life.) You may have Phyrexian Metamorph enter the battlefield as a copy of any artifact or creature on the battlefield, except it's an artifact in addition to its other types.

{U}: Untap Horseshoe Crab.

Flying {1}{U}, {Q}: Target opponent exiles the top card of their library. Until end of turn, you may play that card. ({Q} is the untap symbol.)

Imprint — {T}: Exile target artifact card from a graveyard. Myr Welder has all activated abilities of all cards exiled with it.

Flying, deathtouch, lifelink Nighthawk Scavenger's power is equal to 1 plus the number of card types among cards in your opponents' graveyards.

You may pay {1}{B} rather than pay this spell's mana cost. If the {1}{B} cost was paid, an opponent draws a card. Exile target creature or planeswalker.

Undaunted (This spell costs {1} less to cast for each opponent.) Destroy two target creatures.

If it's not your turn, you may exile a blue card from your hand rather than pay this spell's mana cost. Counter target noncreature spell. If that spell is countered this way, exile it instead of putting it into its owner's graveyard.

Choose one — • Counter target spell. • You may choose new targets for target spell. • Copy target instant or sorcery spell. You may choose new targets for the copy.

You may pay {2}{U} rather than pay this spell's mana cost. If the {2}{U} cost was paid, you draw three cards, then an opponent creates two Treasure tokens and they scry 2. If that cost wasn't paid, you draw X cards.

If Leyline of Anticipation is in your opening hand, you may begin the game with it on the battlefield. You may cast spells as though they had flash.

Consuming Aberration's power and toughness are each equal to the number of cards in your opponents' graveyards. Whenever you cast a spell, each opponent reveals cards from the top of their library until they reveal a land card, then puts those cards into their graveyard.

Indestructible (Damage and effects that say "destroy" don't destroy this creature. If its toughness is 0 or less, it's still put into its owner's graveyard.)

Enchant creature Enchanted creature gets +10/+10 and has trample and annihilator 2. (Whenever it attacks, defending player sacrifices two permanents.)

{B}: Endling gains menace until end of turn. {B}: Endling gains deathtouch until end of turn. {B}: Endling gains undying until end of turn. (When this creature dies, if it had no +1/+1 counters on it, return it to the battlefield under its owner's control with a +1/+1 counter on it.) {1}: Endling gets +1/-1 or -1/+1 until end of turn.

Hexproof (This creature can't be the target of spells or abilities your opponents control.) Invisible Stalker can't be blocked.

{U}: Untap Morphling. {U}: Morphling gains flying until end of turn. {U}: Morphling gains shroud until end of turn. (It can't be the target of spells or abilities.) {1}: Morphling gets +1/-1 until end of turn. {1}: Morphling gets -1/+1 until end of turn.

Enchant artifact Enchanted artifact is a creature with base power and toughness 5/5 in addition to its other types.

Each noncreature artifact is an artifact creature with power and toughness each equal to its mana value. (Equipment that's a creature can't equip a creature.)

You may have Sakashima the Impostor enter the battlefield as a copy of any creature on the battlefield, except its name is Sakashima the Impostor, it's legendary in addition to its other types, and it has "{2}{U}{U}: Return this creature to its owner's hand at the beginning of the next end step."

When Skilled Animator enters the battlefield, target artifact you control becomes an artifact creature with base power and toughness 5/5 for as long as Skilled Animator remains on the battlefield.

Enchant artifact Enchanted artifact is a creature with base power and toughness 5/5 in addition to its other types. When enchanted artifact is put into a graveyard, return that card to its owner's hand.

You may choose not to untap The Blackstaff of Waterdeep during your untap step. Animate Walking Statue — {1}{U}, {T}: Another target nontoken artifact you control becomes a 4/4 artifact creature for as long as The Blackstaff of Waterdeep remains tapped. Activate only as a sorcery.

{1}, {T}, Discard a card: Target noncreature artifact becomes an artifact creature with power and toughness each equal to its mana value until end of turn. (It retains its abilities.)

{T}: Add {C}{C}.

{T}: Add {C}. {1}, {T}: Until end of turn, creatures your opponents control lose hexproof and shroud and can't have hexproof or shroud.

{2}, {T}: Add {B} for each Swamp you control.

As Choked Estuary enters the battlefield, you may reveal an Island or Swamp card from your hand. If you don't, Choked Estuary enters the battlefield tapped. {T}: Add {U} or {B}.

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

Dark Depths enters the battlefield with ten ice counters on it. {3}: Remove an ice counter from Dark Depths. When Dark Depths has no ice counters on it, sacrifice it. If you do, create Marit Lage, a legendary 20/20 black Avatar creature token with flying and indestructible.

{T}: Add {C}. {1}, {T}: Until end of turn, your opponents and creatures your opponents control with hexproof can be the targets of spells and abilities you control as though they didn't have hexproof.

({T}: Add {U}.)

Morphic Pool enters the battlefield tapped unless you have two or more opponents. {T}: Add {U} or {B}.

{T}, Pay 1 life, Sacrifice Polluted Delta: Search your library for an Island or Swamp card, put it onto the battlefield, then shuffle.

({T}: Add {B}.)

{T}: Add {C}. {2}, {T}: Thespian's Stage becomes a copy of target land, except it has this ability.

({T}: Add {U} or {B}.)

Each land is a Swamp in addition to its other land types.

{T}: Add {C}. {1}{B}, {T}: Put target creature card from your graveyard on top of your library.

({T}: Add {U} or {B}.) As Watery Grave enters the battlefield, you may pay 2 life. If you don't, it enters the battlefield tapped.

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

Extort (Whenever you cast a spell, you may pay {W/B}. If you do, each opponent loses 1 life and you gain that much life.) Whenever you tap a Swamp for mana, add an additional {B}.

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

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

At the beginning of your upkeep, flip a coin. If you lose the flip, Mana Crypt deals 3 damage to you. {T}: Add {C}{C}.

{T}: Add {C}{C}.

{U}: Exile Aetherling. Return it to the battlefield under its owner's control at the beginning of the next end step. {U}: Aetherling can't be blocked this turn. {1}: Aetherling gets +1/-1 until end of turn. {1}: Aetherling gets -1/+1 until end of turn.

Create a token that's a copy of target creature you control. Flashback {5}{U}{U} (You may cast this card from your graveyard for its flashback cost. Then exile it.)

{T}: Target player discards a card. Activate only during your turn. Put a -1/-1 counter on Cinderhaze Wretch: Untap Cinderhaze Wretch.

Each opponent loses X life. You gain life equal to the life lost this way.

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

{3}, {T}: Create a token that's a copy of Myr Propagator.

First strike When Nekrataal enters the battlefield, destroy target nonartifact, nonblack creature. That creature can't be regenerated.

Will of the council — Choose target instant or sorcery spell. Starting with you, each player votes for denial or duplication. If denial gets more votes, counter the spell. If duplication gets more votes or the vote is tied, copy the spell. You may choose new targets for the copy.

Defender {T}: Exchange target opponent's life total with Tree of Perdition's toughness.

When Trophy Mage enters the battlefield, you may search your library for an artifact card with mana value 3, reveal it, put it into your hand, then shuffle.

Partner with Cazur, Ruthless Stalker (When this creature enters the battlefield, target player may put Cazur into their hand from their library, then shuffle.) Ukkima, Stalking Shadow can't be blocked. When Ukkima leaves the battlefield, it deals X damage to target player and you gain X life, where X is its power.