Eternal Thirst

Enchant creature
Enchanted creature has lifelink and "Whenever a creature an opponent controls dies, put a +1/+1 counter on this creature." (Damage dealt by a creature with lifelink also causes its controller to gain that much life.)

Contagious Nim

Infect (This creature deals damage to creatures in the form of -1/-1 counters and to players in the form of poison counters.)

Cower in Fear

Creatures your opponents control get -1/-1 until end of turn.

Bog Witch

Blood Fountain

When this artifact enters, create a Blood token. (It's an artifact with "{1}, {T}, Discard a card, Sacrifice this token: Draw a card.")
{3}{B}, {T}, Sacrifice this artifact: Return up to two target creature cards from your graveyard to your hand.

Bone Picker

This spell costs {3} less to cast if a creature died this turn.
Flying, deathtouch

Viscera Seer

Sacrifice a creature: Scry 1. (Look at the top card of your library. You may put that card on the bottom.)

Altar's Reap

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

Carrier Thrall

When this creature dies, create a 1/1 colorless Eldrazi Scion creature token. It has "Sacrifice this token: Add {C}."

Morbid Curiosity

As an additional cost to cast this spell, sacrifice an artifact or creature.
Draw cards equal to the mana value of the sacrificed permanent.

Victim of Night

Destroy target non-Vampire, non-Werewolf, non-Zombie creature.

Grasp of Darkness

Target creature gets -4/-4 until end of turn.

Cabal Torturer

{B}, {T}: Target creature gets -1/-1 until end of turn.
Threshold — {3}{B}{B}, {T}: Target creature gets -2/-2 until end of turn. Activate only if seven or more cards are in your graveyard.

Deathgreeter

Whenever another creature dies, you may gain 1 life.

Death's-Head Buzzard

Flying
When this creature dies, all creatures get -1/-1 until end of turn.

Undying Malice

Until end of turn, target creature gains "When this creature dies, return it to the battlefield tapped under its owner's control with a +1/+1 counter on it."

Arcane Signet

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

Blitz Leech

Flash
When this creature enters, target creature an opponent controls gets -2/-2 until end of turn. Remove all counters from that creature.

Banehound

Bone Harvest

Put any number of target creature cards from your graveyard on top of your library.
Draw a card at the beginning of the next turn's upkeep.

Blister Beetle

When this creature enters, target creature gets -1/-1 until end of turn.

Cabal Ritual

Add {B}{B}{B}.
Threshold — Add {B}{B}{B}{B}{B} instead if seven or more cards are in your graveyard.

Deadeye Tormentor

Raid — When this creature enters, if you attacked this turn, target opponent discards a card.

Mutilate

All creatures get -1/-1 until end of turn for each Swamp you control.

Dark Ritual

Deadly Dispute

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 token: Add one mana of any color.")

Blood Pet

Abyssal Gatekeeper

When this creature dies, each player sacrifices a creature of their choice.

Bala Ged Scorpion

When this creature enters, you may destroy target creature with power 1 or less.

Corpse Blockade

Defender
Sacrifice another creature: This creature gains deathtouch until end of turn.

Changeling Outcast

Changeling (This card is every creature type.)
This creature can't block and can't be blocked.

Broodrage Mycoid

At the beginning of your end step, if you descended this turn, create a 1/1 black Fungus creature token with "This token can't block." (You descended if a permanent card was put into your graveyard from anywhere.)

Unearth

Return target creature card with mana value 3 or less from your graveyard to the battlefield.
Cycling {2} ({2}, Discard this card: Draw a card.)

Butcher Ghoul

Undying (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.)

Call to the Netherworld

Return target black creature card from your graveyard to your hand.
Madness {0} (If you discard this card, discard it into exile. When you do, cast it for its madness cost or put it into your graveyard.)

Bladebrand

Target creature gains deathtouch until end of turn.
Draw a card.

Yahenni, Undying Partisan

Haste
Whenever a creature an opponent controls dies, put a +1/+1 counter on Yahenni.
Sacrifice another creature: Yahenni gains indestructible until end of turn.

Haunted Cloak

Equipped creature has vigilance, trample, and haste.
Equip {1} ({1}: Attach to target creature you control. Equip only as a sorcery.)

Feign Death

Geth's Verdict

Target player sacrifices a creature of their choice and loses 1 life.

Diabolic Edict

Target player sacrifices a creature of their choice.

Briarblade Adept

Whenever this creature attacks, target creature an opponent controls gets -1/-1 until end of turn.
Encore {3}{B} ({3}{B}, Exile this card from your graveyard: For each opponent, create a token copy that attacks that opponent this turn if able. They gain haste. Sacrifice them at the beginning of the next end step. Activate only as a sorcery.)

Tragic Slip

Target creature gets -1/-1 until end of turn.
Morbid — That creature gets -13/-13 until end of turn instead if a creature died this turn.

Charcoal Diamond

This artifact enters tapped.
{T}: Add {B}.

Blood Seeker

Whenever a creature an opponent controls enters, you may have that player lose 1 life.

Corrupted Conviction

Persistent Specimen

{2}{B}: Return this card from your graveyard to the battlefield tapped.

Corrupt Court Official

When this creature enters, target opponent discards a card.

Tainted Strike

Target creature gets +1/+0 and gains infect until end of turn. (It deals damage to creatures in the form of -1/-1 counters and to players in the form of poison counters.)

Wedding Invitation

When this artifact enters, draw a card.
{T}, Sacrifice this artifact: Target creature can't be blocked this turn. If it's a Vampire, it also gains lifelink until end of turn.

Creeping Bloodsucker

At the beginning of your upkeep, this creature deals 1 damage to each opponent. You gain life equal to the damage dealt this way.

Dash Hopes

When you cast this spell, any player may pay 5 life. If a player does, counter Dash Hopes.
Counter target spell.

Blood Beckoning

Kicker {3} (You may pay an additional {3} as you cast this spell.)
Return target creature card from your graveyard to your hand. If this spell was kicked, instead return two target creature cards from your graveyard to your hand.

Demon's Disciple

When this creature enters, each player sacrifices a creature or planeswalker of their choice.

Cabal Surgeon

{2}{B}{B}, {T}, Exile two cards from your graveyard: Return target creature card from your graveyard to your hand.

Brainspoil

Destroy target creature that isn't enchanted. It can't be regenerated.
Transmute {1}{B}{B} ({1}{B}{B}, Discard this card: Search your library for a card with the same mana value as this card, reveal it, put it into your hand, then shuffle. Transmute only as a sorcery.)

Corpse Hauler

{2}{B}, Sacrifice this creature: Return another target creature card from your graveyard to your hand.

Burglar Rat

When this creature enters, each opponent discards a card.

Deadbridge Shaman

When this creature dies, target opponent discards a card.

Cadaver Imp

Flying
When this creature enters, you may return target creature card from your graveyard to your hand.

Blood Pact

Target player draws two cards and loses 2 life.

Bone Shards

As an additional cost to cast this spell, sacrifice a creature or discard a card.
Destroy target creature or planeswalker.

Black Cat

When this creature dies, target opponent discards a card at random.

Gift of Fangs

Enchant creature
Enchanted creature gets +2/+2 as long as it's a Vampire. Otherwise, it gets -2/-2.

Defile

Target creature gets -1/-1 until end of turn for each Swamp you control.

Crypt Rats

{X}: This creature deals X damage to each creature and each player. Spend only black mana on X.

Tenacious Dead

When this creature dies, you may pay {1}{B}. If you do, return it to the battlefield tapped under its owner's control.

Doomed Dissenter

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

Cast Down

Feed the Swarm

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

Supernatural Stamina

Until end of turn, target creature gets +2/+0 and gains "When this creature dies, return it to the battlefield tapped under its owner's control."

Commander's Sphere

{T}: Add one mana of any color in your commander's color identity.
Sacrifice this artifact: Draw a card.