Hedron Fields of Agadeem
From March of the Machine Commander set
Hedron Fields of Agadeem
Plane — Zendikar
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.)
Rulings
- A creature's power is checked when attackers or blockers are declared. Increasing the power of an attacking or blocking creature to 7 or greater won't remove that creature from combat.