Avatar Kuruk

Lifelink

{u}{u}: You can only activate this ability once per turn during an opponent's combat phase. Sacrifice a non-token creature you control and prevent all damage that would be dealt to you by a target attacking creature that opponent controls. Remove that creature from combat. During your next turn, Kuruk gains trample and gets +X/+0 until end
of turn, where X is the attacking creature's power.

"You must actively shape your own destiny, and the destiny of the world."