Grimgrin, Corpse-Born [Innistrad]

Description

Set:	Innistrad
Type:	Legendary Creature — Zombie Warrior
Rarity:	Mythic
Cost:	{3}{U}{B}

Grimgrin, Corpse-Born enters the battlefield tapped and doesn't untap during your untap step.
Sacrifice another creature: Untap Grimgrin and put a +1/+1 counter on it.
Whenever Grimgrin attacks, destroy target creature defending player controls, then put a +1/+1 counter on Grimgrin.