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.)

Scare Tactics

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

Pulse Tracker

Whenever this creature attacks, each opponent loses 1 life.

Carnophage

At the beginning of your upkeep, tap this creature unless you pay 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.)

Fume Spitter

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

Swamp

Thornbow Archer

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

Boon of Erebos

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

Dark Ritual

Vampire Lacerator

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

Dash Hopes

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

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.)

Bile Urchin

Sacrifice this creature: Target player loses 1 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.)