Ruthless Cullblade

This creature gets +2/+1 as long as an opponent has 10 or less life.

Tyrant's Choice

Will of the council — Starting with you, each player votes for death or torture. If death gets more votes, each opponent sacrifices a creature of their choice. If torture gets more votes or the vote is tied, each opponent loses 4 life.

Swamp

Child of Night

Vampire's Bite

Kicker {2}{B} (You may pay an additional {2}{B} as you cast this spell.)
Target creature gets +3/+0 until end of turn. If this spell was kicked, that creature gains lifelink until end of turn. (Damage dealt by the creature also causes its controller to gain that much life.)

Pulse Tracker

Whenever this creature attacks, each opponent loses 1 life.

Victim of Night

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

Night's Whisper

Diabolic Edict

Target player sacrifices a creature of their choice.

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.

Vampire Lacerator

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

Sign in Blood

Target player draws two cards and loses 2 life.

Geth's Verdict

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

Blood Seeker

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

Guul Draz Vampire

As long as an opponent has 10 or less life, this creature gets +2/+1 and has intimidate. (It can't be blocked except by artifact creatures and/or creatures that share a color with it.)