As an additional cost to cast this spell, sacrifice a creature. Draw two cards.

{1}, {T}, Sacrifice another creature: You gain life equal to the sacrificed creature's toughness. Draw a card.

As an additional cost to cast this spell, sacrifice a creature. Draw two cards.

As an additional cost to cast this spell, sacrifice an artifact or creature. Draw two cards.

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 artifact: Add one mana of any color.")

Defender Tap three untapped creatures you control: Surveil 1. (Look at the top card of your library. You may put that card into your graveyard.)

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

Charcoal Diamond enters the battlefield tapped. {T}: Add {B}.

When Ecologist's Terrarium enters the battlefield, you may search your library for a basic land card, reveal it, put it into your hand, then shuffle. {2}, {T}, Sacrifice Ecologist's Terrarium: Put a +1/+1 counter on target creature. Activate only as a sorcery.

{T}: Add {C}. {1}, {T}, Sacrifice Mind Stone: Draw a card.

Sky Diamond enters the battlefield tapped. {T}: Add {U}.

Flying When Aven Eternal enters the battlefield, amass Zombies 1. (Put a +1/+1 counter on an Army you control. It's also a Zombie. If you don't control an Army, create a 0/0 black Zombie Army creature token first.)

Return target nonland permanent to its owner's hand. Amass Zombies 1. (Put a +1/+1 counter on an Army you control. It's also a Zombie. If you don't control an Army, create a 0/0 black Zombie Army creature token first.)

Counter target spell unless its controller pays {2}. Amass Zombies 2. (Put two +1/+1 counters on an Army you control. It's also a Zombie. If you don't control an Army, create a 0/0 black Zombie Army creature token first.)

When Herald of the Dreadhorde dies, amass Zombies 2. (Put two +1/+1 counters on an Army you control. It's also a Zombie. If you don't control an Army, create a 0/0 black Zombie Army creature token first.)

When Lazotep Reaver enters the battlefield, amass Zombies 1. (Put a +1/+1 counter on an Army you control. It's also a Zombie. If you don't control an Army, create a 0/0 black Zombie Army creature token first.)

Amass Zombies 3. (Put three +1/+1 counters on an Army you control. It's also a Zombie. If you don't control an Army, create a 0/0 black Zombie Army creature token first.)

Whenever equipped creature attacks, put a +1/+1 counter on it. Equip {2} ({2}: Attach to target creature you control. Equip only as a sorcery.)

Carrion Feeder can't block. Sacrifice a creature: Put a +1/+1 counter on Carrion Feeder.

Buyback {3} (You may pay an additional {3} as you cast this spell. If you do, put this card into your hand as it resolves.) Choose a counter on target permanent or suspended card. Remove that counter from that permanent or card or put another of those counters on it.

Whenever another creature you control dies, put a +1/+1 counter on Gavony Unhallowed.

Lifelink Mold Harvest — {1}, Sacrifice another creature or an artifact: Put a +1/+1 counter on Mold Folk.

Sacrifice Myr Scrapling: Put a +1/+1 counter on target creature.

{1}, Sacrifice another creature: Put a +1/+1 counter on target creature. Activate only as a sorcery.

Exile target creature you control, then return that card to the battlefield under its owner's control. Draw a card.

Exile up to two target creatures you control, then return those cards to the battlefield under their owner's control.

Exile two target artifacts, creatures, and/or lands you control, then return those cards to the battlefield under your control.

Exile target artifact or creature, then return it to the battlefield under its owner's control with a +1/+1 counter on it.

Toxic 1 (Players dealt combat damage by this creature also get a poison counter.) When Blightbelly Rat dies, proliferate. (Choose any number of permanents and/or players, then give each another counter of each kind already there.)

Proliferate. (Choose any number of permanents and/or players, then give each another counter of each kind already there.) Draw a card.

Look at the top three cards of your library. Put one of them into your hand and the rest on the bottom of your library in any order. Proliferate. (Choose any number of permanents and/or players, then give each another counter of each kind already there.)

Counter target spell, then proliferate. (Choose any number of permanents and/or players, then give each another counter of each kind already there.)

Put a -1/-1 counter on target creature, then proliferate. (Choose any number of permanents and/or players, then give each another counter of each kind already there.)

Flying Whenever Guildpact Informant deals combat damage to a player or planeswalker, proliferate. (Choose any number of permanents and/or players, then give each another counter of each kind already there.)

Enchant creature When Mesmerizing Dose enters the battlefield, tap enchanted creature, then proliferate. (Choose any number of permanents and/or players, then give each another counter of each kind already there.) Enchanted creature doesn't untap during its controller's untap step.

Destroy target creature, then proliferate. (Choose any number of permanents and/or players, then give each another counter of each kind already there.)

Proliferate. (Choose any number of permanents and/or players, then give each another counter of each kind already there.) Draw a card.

Flying Whenever Thrummingbird deals combat damage to a player, proliferate. (Choose any number of permanents and/or players, then give each another counter of each kind already there.)

Draw three cards. Proliferate. (Choose any number of permanents and/or players, then give each another counter of each kind already there.)

When Diregraf Horde enters the battlefield, create two 2/2 black Zombie creature tokens with decayed. When you do, exile up to two target cards from graveyards. (A creature with decayed can't block. When it attacks, sacrifice it at end of combat.)

When Doomed Dissenter dies, create a 2/2 black Zombie creature token.

Flying When Falcon Abomination enters the battlefield, create a 2/2 black Zombie creature token with decayed. (It can't block. When it attacks, sacrifice it at end of combat.)

Counter target spell unless its controller pays {4}. Create a 2/2 black Zombie creature token with decayed. (It can't block. When it attacks, sacrifice it at end of combat.)

{3}{B}, Exile Ghoulcaller's Accomplice from your graveyard: Create a 2/2 black Zombie creature token. Activate only as a sorcery.

Deathtouch When Hobbling Zombie dies, create a 2/2 black Zombie creature token with decayed. (It can't block. When it attacks, sacrifice it at end of combat.)

When Maalfeld Twins dies, create two 2/2 black Zombie creature tokens.

Create two 2/2 black Zombie creature tokens. Flashback {5}{B}{B} (You may cast this card from your graveyard for its flashback cost. Then exile it.)

Target opponent discards two cards. You create a 2/2 black Zombie creature token with decayed. (It can't block. When it attacks, sacrifice it at end of combat.)

When Rank Officer enters the battlefield, you may discard a card. If you do, create a 2/2 black Zombie creature token. {1}{B}, {T}, Exile a creature card from your graveyard: Each opponent loses 2 life.

Create a 2/2 black Zombie creature token. Flashback {4}{U} (You may cast this card from your graveyard for its flashback cost. Then exile it.)

Exile up to one target card from a graveyard. Create a 2/2 black Zombie creature token with decayed. (It can't block. When it attacks, sacrifice it at end of combat.) Flashback {1}{B} (You may cast this card from your graveyard for its flashback cost. Then exile it.)

Exile target creature card from a graveyard. Create a 2/2 black Zombie creature token. You gain 2 life.

Tap three untapped creatures you control: Each opponent loses 1 life.

Target creature gets -2/-0 until end of turn. Create a 2/2 black Zombie creature token with decayed. (It can't block. When it attacks, sacrifice it at end of combat.) Draw a card.

When Archaeomancer enters the battlefield, return target instant or sorcery card from your graveyard to your hand.

Return target creature card from your graveyard to your hand. Put a +1/+1 counter on up to one target Zombie you control. Flashback {3}{B} (You may cast this card from your graveyard for its flashback cost. Then exile it.)

Defender When Mnemonic Wall enters the battlefield, you may return target instant or sorcery card from your graveyard to your hand.

{T}: Add {C}. {3}, {T}, Sacrifice Cradle of the Accursed: Create a 2/2 black Zombie creature token. Activate only as a sorcery.

({T}: Add {U}.)