Erzsebet, Countess of Blood

At the beginning of each opponent's upkeep, if that player controls more creatures than you, he
or she sacrifices a creature.
During your upkeep, any opponent who has sacrificed a creature and has fewer creatures than you may pay {3} to exile Erzsebet, Countess of Blood.

"She was a butcher of unparalleled talent, until people started to notice the dead bodies."