The Raven Lady

Reach, haste. Ward: Sacrifice a creature.
The Raven Lady's power is equal to twice the
number of ravens in play.
{1}{b}{t}: Create two black 1/1 crow creature
tokens with flying.
{b}{b}{t}, sacrifice X creatures: Role a d6. Up to
twice that many creatures get -X/-X until end of
turn.
Dark Magic