As an additional cost to cast this spell, sacrifice a creature.
All creatures get -X/-X until end of turn, where X is the sacrificed creature's power.

, : Destroy target creature. If that creature dies this way, create a black Vampire creature token. Its power is equal to that creature's power and its toughness is equal to that creature's toughness.

Flying
Whenever a creature an opponent controls is dealt damage, put a +1/+1 counter on Kazarov.
: Kazarov deals 2 damage to target creature.

Choose a creature type. Destroy all creatures that aren't of the chosen type.

Whenever a creature an opponent controls dies, you may pay . If you do, return that card to the battlefield under your control. If it's a creature, it's a Zombie in addition to its other creature types.
: Regenerate target Zombie.

Flying
Whenever a creature card is put into an opponent's graveyard from anywhere, you may pay life equal to its mana value. If you do, put it onto the battlefield under your control. It's a Warlock in addition to its other types.
If a Warlock you control would die, exile it instead.

When this creature enters, sacrifice it unless you sacrifice two Swamps.

Exchange your graveyard and library. Then shuffle your library.

If an opponent gained life this turn, you may pay rather than pay this spell's mana cost.
Target player loses 5 life and you gain 5 life.

Flying
When this creature enters, you may destroy target creature.
Whenever a nontoken creature an opponent controls dies, create a tapped 2/2 black Zombie creature token.

Rat offering (You may cast this card any time you could cast an instant by sacrificing a Rat and paying the difference in mana costs between this and the sacrificed Rat. Mana cost includes color.)
Whenever a permanent is put into an opponent's graveyard, that player loses 1 life.

When you cast this spell, any player may discard three cards. If a player does, counter Phantasmagorian.
Discard three cards: Return this card from your graveyard to your hand.

, Sacrifice this creature: Destroy target nonblack creature.
Soulshift 6

Whenever this creature attacks, if defending player has two or fewer cards in hand, it gains flying until end of turn.

Each player's life total becomes the lowest life total among all players.

Return all Nightstalker permanent cards from your graveyard to the battlefield. Then destroy all Swamps you control.

Menace
When this creature enters, return up to X target Zombie cards from your graveyard to the battlefield, where X is the number of opponents you have.

Flying
When this creature enters, search your library for a card, put it into your hand, then shuffle.

Flying
You may cast this creature from your graveyard by paying and sacrificing two creatures rather than paying its mana cost.

Intimidate
When this creature enters, for each opponent, you may put up to one target creature card from that player's graveyard onto the battlefield under your control.

Flying
Shauku can't attack if there's another creature on the battlefield.
At the beginning of your upkeep, you lose 3 life.
: Exile target creature and put a +1/+1 counter on Shauku.

Flying
When this creature enters, all other creatures get -2/-2 until end of turn.
Cycling

Swampwalk
At the beginning of your upkeep, return target creature card from your graveyard to the battlefield.
At the beginning of each opponent's upkeep, that player sacrifices a creature of their choice.

You may exile two black cards from your hand rather than pay this spell's mana cost.
Soul Spike deals 4 damage to any target and you gain 4 life.

When this creature enters, mill three cards, then return any number of artifact creature cards with total mana value 6 or less from your graveyard to the battlefield.

At the beginning of each opponent's upkeep, you manifest the top card of that player's library.
Whenever a creature you control but don't own dies, its owner loses 2 life and you gain 2 life.

At the beginning of each end step, put a slime counter on each creature you don't control.
Creatures you don't control get -1/-1 for each slime counter on them.
Whenever a creature you don't control with a slime counter on it dies, create a 1/1 black Slug creature token.
, Sacrifice a Slug: Draw a card.

Flying
Prevent all damage that would be dealt to this creature by creatures with first strike.

Vampiric Feast deals 4 damage to any target and you gain 4 life.