Pery, the Crow Master

+2: Creat 2 1/1 black Crow creatur tokens with flying
-2: All crows become 5/5 deathtouch, flying Crow creatur tokens with exile this creature after 2 rounds
-10: All crows become 12/5 deathtouch, livelink, flying Crow creatur tokens with exile this creature after 1 round