Altar's Reap

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

Flesh Reaver

Whenever Flesh Reaver deals damage to a creature or opponent, Flesh Reaver deals that much damage to you.

Vampire Lacerator

At the beginning of your upkeep, you lose 1 life unless an opponent has 10 or less life.

Carnophage

At the beginning of your upkeep, tap Carnophage unless you pay 1 life.

Festering Goblin

When Festering Goblin dies, target creature gets -1/-1 until end of turn.

Feed the Swarm

Destroy target creature or enchantment an opponent controls. You lose life equal to that permanent's mana value.

Mortivore

Mortivore's power and toughness are each equal to the number of creature cards in all graveyards.
{B}: Regenerate Mortivore.

Kormus Bell

All Swamps are 1/1 black creatures that are still lands.

Nip Gwyllion

Lifelink (Damage dealt by this creature also causes you to gain that much life.)

Blood Pet

Lotus Petal

{T}, Sacrifice Lotus Petal: Add one mana of any color.

Sign in Blood

Target player draws two cards and loses 2 life.

Nightmare Lash

Equipped creature gets +1/+1 for each Swamp you control.
Equip—Pay 3 life. (Pay 3 life: Attach to target creature you control. Equip only as a sorcery. This card enters the battlefield unattached and stays on the battlefield if the creature leaves.)

Demonic Tutor

Search your library for a card, put that card into your hand, then shuffle.

Swamp

Bad Moon

Toxic Deluge

As an additional cost to cast this spell, pay X life.
All creatures get -X/-X until end of turn.

Erg Raiders

At the beginning of your end step, if Erg Raiders didn't attack this turn, Erg Raiders deals 2 damage to you unless it came under your control this turn.

Black Vise

As Black Vise enters the battlefield, choose an opponent.
At the beginning of the chosen player's upkeep, Black Vise deals X damage to that player, where X is the number of cards in their hand minus 4.

Foul Imp

Flying
When Foul Imp enters the battlefield, you lose 2 life.

Reanimate

Put target creature card from a graveyard onto the battlefield under your control. You lose life equal to its mana value.

Dauthi Slayer

Shadow (This creature can block or be blocked by only creatures with shadow.)
Dauthi Slayer attacks each combat if able.

Wretched Anurid

Whenever another creature enters the battlefield, you lose 1 life.

Kjeldoran Dead

When Kjeldoran Dead enters the battlefield, sacrifice a creature.
{B}: Regenerate Kjeldoran Dead.

Dark Ritual

Hypnotic Specter

Flying
Whenever Hypnotic Specter deals damage to an opponent, that player discards a card at random.