Blinding Ambush

At the beginning of your upkeep, if three or more creatures attacked you or planeswalkers you control since your last turn, until end of turn all creatures you control lose Defender and gain First Strike.
Whenever a creature attacks you or a planeswalker you control, tap that creature and it's controller may pay {2}. If they don't, create a 2/2 White Angel Spirit creature with Flying, Lifelink and Defender.