Hedron Fields of Agadeem (Planechase 2012) (OVER-019) - Planechase 2012 Planes Foil

Creatures with power 7 or greater can't attack or block.
Whenever chaos ensues, create a 7/7 colorless Eldrazi creature token with annihilator 1. (Whenever it attacks, defending player sacrifices a permanent of their choice.)