Spells your opponents cast that target this creature cost less to cast.
When this creature dies, return it to the battlefield transformed under your control attached to target opponent.

When Acererak enters, if you haven't completed Tomb of Annihilation, return Acererak to its owner's hand and venture into the dungeon.
Whenever Acererak attacks, for each opponent, you create a 2/2 black Zombie creature token unless that player sacrifices a creature of their choice.

Flying, deathtouch
Megamorph
When this creature is turned face up, put a +1/+1 counter on each other Dragon creature you control.

Flying, lifelink
Whenever Aclazotz attacks, each opponent discards a card. For each opponent who can't, you draw a card.
Whenever an opponent discards a land card, create a 1/1 black Bat creature token with flying.
When Aclazotz dies, return it to the battlefield tapped and transformed under its owner's control.

, Sacrifice another creature or artifact: Each opponent loses 1 life and you gain 1 life.

, : Target player loses 1 life.

Whenever you cast a spell with a squirrel in its art, you get (an acorn counter).
Whenever a Squirrel you control enters or dies, you get .
, Pay X : Target creature gets -X/-X until end of turn.
, Pay X : Target creature gets +X/+X until end of turn.

When this creature enters, target opponent reveals a number of cards from their hand equal to the number of creatures in your party. You choose one of those cards. That player discards that card. (Your party consists of up to one of each Cleric, Rogue, Warrior, and Wizard.)

Flash
You may have this creature enter as a copy of any creature card in a graveyard that was put there from the battlefield this turn, except it's a Phyrexian in addition to its other types.

Reveal the top card of your library and put that card into your hand. You lose life equal to its mana value. You may repeat this process any number of times.

Choose a color. Target player reveals their hand and you choose a card of that color from it. That player discards that card.

Target creature gets -3/-3 until end of turn. Target player mills three cards. You gain 3 life.

Skeletons, Vampires, and Zombies you control get +1/+1.
At the beginning of your end step, if a creature died this turn, create a 1/1 black Skeleton creature token.

Look at the top four cards of your library. Put two of them into your hand and the rest into your graveyard. You lose 2 life.

Ninjutsu
Whenever Dokuchi Silencer deals combat damage to a player, you may discard a card. When you do, destroy target creature or planeswalker that player controls.

When this creature dies, create a 2/2 black Zombie Druid creature token.
Renew — , Exile this card from your graveyard: Put a +1/+1 counter on target creature. Activate only as a sorcery.

This creature enters prepared.

When Elderfang Ritualist dies, you may exile it. If you do, return another target Elf or Tyvar card from your graveyard to your hand.

Choose an artist. Exile the top six cards of your library, then reveal cards from the top of your library until you reveal a card with art by the chosen artist. Put that card in your hand and exile all other cards revealed this way.

Deathtouch
When this creature enters, you get .
Whenever this creature attacks, you may pay . If you do, create a 1/1 colorless Servo artifact creature token.

Remove all counters from all permanents and exile all tokens.

Deathtouch
: Transform this creature. Activate only as a sorcery. ( can be paid with either or 2 life.)

Flying, lifelink
When this creature enters, move any number of +1/+1 counters from other permanents you control onto this creature.

Target creature gets -11/-11 until end of turn.

Return up to one target creature card from your graveyard to your hand. Venture into the dungeon.

Target creature gets -1/-1 until end of turn.
Draw a card.

Delve
For each player, choose up to one target creature card in that player's graveyard. Put those cards onto the battlefield under your control. They're Zombies in addition to their other types.

: Put target creature card from an opponent's graveyard onto the battlefield under your control if its mana value is less than or equal to the number of Allies you control.

Whenever this creature attacks, defending player loses 1 life and you gain 1 life.