Pulse Tracker

Whenever this creature attacks, each opponent loses 1 life.

Carnophage

At the beginning of your upkeep, tap Carnophage unless you pay 1 life.

Undying Evil

Target creature gains undying until end of turn. (When it 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.)

Dark Ritual

Tormented Soul

Tormented Soul can't block and can't be blocked.

Guul Draz Vampire

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

Swamp

Thornbow Archer

Whenever Thornbow Archer attacks, each opponent who doesn't control an Elf loses 1 life.

Scare Tactics

Creatures you control get +1/+0 until end of turn.

Vampire Lacerator

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

Boon of Erebos

Target creature gets +2/+0 until end of turn. Regenerate it. You lose 2 life.

Bump in the Night

Target opponent loses 3 life.
Flashback {5}{R} (You may cast this card from your graveyard for its flashback cost. Then exile it.)

Fume Spitter

Sacrifice Fume Spitter: Put a -1/-1 counter on target creature.

Dash Hopes

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

Death Cultist

Sacrifice Death Cultist: Target player loses 1 life and you gain 1 life.

Bile Urchin

Sacrifice Bile Urchin: Target player loses 1 life.

Vault Skirge

({B/P} can be paid with either {B} or 2 life.)
Flying
Lifelink (Damage dealt by this creature also causes you to gain that much life.)