Wylan, Winter's Rage

+1: Wylan, Winter's Rage deals X damage to target creature where X is the number of knights you control
0: Wylan, Winter's Rage becomes a 5/5 knight with indestructible until end of turn. prevent all damage that would be dealt to him this turn
-7: tap all creatures target opponent controls. Creatures you control get +X/+X where X is the number of tapped creatures target opponent controls