The Black Queen

+1: Create three 1/1 black Crow tokens with "Flying, has the Bird type". You may then sacrifice three crows to gain 3 life.
-4: Create a Curse of Darkness Enchantment token with "Creatures target opponent control get -1/-1" Prevent all combat damage until your next upkeep.
-X: Destroy Y Creatures, Gain Y Life, and Draw Y Cards. Where Y is X divided by three (rounded down).