Cosmos, That Which Shines

+2: Put a cosmic counter and three +1/+1 counters on target creature you control.
0: Cosmos, That Which Shines becomes a 10/10 Celestial Warrior until end of turn. Prevent all damage that would be dealt to him this turn.
-15: Each creature you control with a cosmic counter on it becomes a Celestial Warrior with a base power and toughness of 10 until end of turn.