Altar's Reap

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

Griptide

Put target creature on top of its owner's library.

Dreadwaters

Target player mills X cards, where X is the number of lands you control.

Undead Alchemist

If a Zombie you control would deal combat damage to a player, instead that player mills that many cards.
Whenever a creature card is put into an opponent's graveyard from their library, exile that card and create a 2/2 black Zombie creature token.

Death Wind

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

Sightless Ghoul

Sightless Ghoul can't block.
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.)

Crypt Creeper

Sacrifice Crypt Creeper: Exile target card from a graveyard.

Blood Artist

Whenever Blood Artist or another creature dies, target player loses 1 life and you gain 1 life.

Walking Corpse

Gravepurge

Put any number of target creature cards from your graveyard on top of your library.
Draw a card.

Marrow Bats

Flying
Pay 4 life: Regenerate Marrow Bats.

Screeching Skaab

When Screeching Skaab enters, mill two cards.

Bloodflow Connoisseur

Sacrifice a creature: Put a +1/+1 counter on Bloodflow Connoisseur.

Swamp

Niblis of the Breath

Flying
{U}, {T}: You may tap or untap target creature.

Into the Void

Return up to two target creatures to their owners' hands.

Vampire Interloper

Selhoff Occultist

Whenever Selhoff Occultist or another creature dies, target player mills a card.

Murder of Crows

Flying
Whenever another creature dies, you may draw a card. If you do, discard a card.

Moan of the Unhallowed

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.)

Soulcage Fiend

When Soulcage Fiend dies, each player loses 3 life.

Fleeting Distraction

Target creature gets -1/-0 until end of turn.
Draw a card.

Dream Twist

Target player mills three cards.
Flashback {1}{U} (You may cast this card from your graveyard for its flashback cost. Then exile it.)

Reap the Seagraf

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.)