Exsanguinate

Each opponent loses X life. You gain life equal to the life lost this way.

Necropotence

Skip your draw step.
Whenever you discard a card, exile that card from your graveyard.
Pay 1 life: Exile the top card of your library face down. Put that card into your hand at the beginning of your next end step.

Disfigure

Target creature gets -2/-2 until end of turn.

Swamp

Grasp of Darkness

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

Dark Ritual

Vampire Nighthawk

Flying
Deathtouch (Any amount of damage this deals to a creature is enough to destroy it.)
Lifelink (Damage dealt by this creature also causes you to gain that much life.)

Deathgreeter

Whenever another creature dies, you may gain 1 life.

Diabolic Edict

Target player sacrifices a creature of their choice.

Last Laugh

Whenever a permanent other than Last Laugh is put into a graveyard from the battlefield, Last Laugh deals 1 damage to each creature and each player.
When no creatures are on the battlefield, sacrifice Last Laugh.

Exquisite Blood

Whenever an opponent loses life, you gain that much life.

Kalitas, Traitor of Ghet

Lifelink
If a nontoken creature an opponent controls would die, instead exile that card and create a 2/2 black Zombie creature token.
{2}{B}, Sacrifice another Vampire or Zombie: Put two +1/+1 counters on Kalitas, Traitor of Ghet.

Dismember

({B/P} can be paid with either {B} or 2 life.)
Target creature gets -5/-5 until end of turn.

Vampiric Link

Enchant creature
Whenever enchanted creature deals damage, you gain that much life.