Swamp

Basal Thrull

{T}, Sacrifice this creature: Add {B}{B}.

Bottle Gnomes

Sacrifice this creature: You gain 3 life.

Arcbound Ravager

Sacrifice an artifact: Put a +1/+1 counter on this creature.
Modular 1 (This creature enters with a +1/+1 counter on it. When it dies, you may put its +1/+1 counters on target artifact creature.)

Grim Haruspex

Morph {B} (You may cast this card face down as a 2/2 creature for {3}. Turn it face up any time for its morph cost.)
Whenever another nontoken creature you control dies, draw a card.

Moriok Replica

{1}{B}, Sacrifice this creature: You draw two cards and you lose 2 life.

Blood Pet

Bloodflow Connoisseur

Sacrifice a creature: Put a +1/+1 counter on this creature.

Mortal Combat

At the beginning of your upkeep, if twenty or more creature cards are in your graveyard, you win the game.

Armor Thrull

{T}, Sacrifice this creature: Put a +1/+2 counter on target creature.

Blood Vassal

Carrion Feeder

This creature can't block.
Sacrifice a creature: Put a +1/+1 counter on this creature.

Stirge

Flying
This creature can't block.
Blood Drain — {1}{B}, Pay 1 life, Sacrifice this creature: Draw a card.

Silversmote Ghoul

At the beginning of your end step, if you gained 3 or more life this turn, return this card from your graveyard to the battlefield tapped.
{1}{B}, Sacrifice this creature: Draw a card.

Midnight Reaper

Whenever a nontoken creature you control dies, this creature deals 1 damage to you and you draw a card.