Acerlock, the Fel

+2: Destroy up to one target creature, enchantment, or artifact.
0: Until the end of turn Acerlock, the Fel becomes a 4/4 Shaman with trample that is still a planeswalker. Prevent all damage dealt to him.
-6: Until the end of turn Acerlock, the Fel becomes a 6/6 Dragon with flying that is still a planeswalker. Prevent all damage dealt to him.