Cho'Gath, Terror of the Void

Hunger, menace, lifelink
Cho'Gath enters the battlefield with X +1/+1 counters on it.
Ultimate — {b}{b}, {t}: Destroy target creature or planeswalker with converted mana cost less than
Cho'Gath's power. If you do, put a number of
+1/+1 counters on Cho'Gath equal to that
permanent's converted mana cost.