Rana, Titan Eater

0: Deal 3 damage to target creature or player. If a creature died this turn, put two loyalty counters on Rana, Titan Eater.
-2: Sacrifice a creature, then deal damage to target creature or player equal to that creature's converted mana cost.
-7: Exile all creatures in all graveyards, then deal X damage to target player where X is twice the number of creatures exiled this way.