Grimgrin, Corpse-Born

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.