Maleva, Seeker of Vengeance

Flying, Lifelink
Whenever a creature deals damage to another creature you control, destroy that creature. Put a -1/-1 counter on Maleva, Seeker of Vengeance.
"Sigarda warned that vengeance would consume her. Bruna counseled that she crossed a line. Gisela begged her to return to justice. But my pleas came too late--She was gone before I could say that she embodied the evil she sought to destroy. "
--Archangel Avacyn