Cassy, hero of Knights

+1: Target creature gains your choice of First Strike or Vigilance until end of turn.
-7: Put a +1/+1 counter on all creatures you control and a loyalty counter on all planeswalkers you control.
0: Until your next turn, Cassy Becomes a 4/5 Elf Knight creature with Vigilance and Indestructible. Prevent all damage dealt to Cassy.