Ghorac, God of Carnage

Haste, indestructible
All creatures have "{1}, {t}: This creature deals damage equal to its power to target creature. If {b} or {r} was spent to activate this ability, the targeted creature's controller loses 1 life."
At the beginning of each opponent's end step, that player sacrifices a creature, then loses life equal to the number of creatures he or she controls.