Edict of the Great Balance

Target player sacrifices an attacking creature for each creature you control.
"Our defenses were holding agains the nightmares, and the battle was going well. But then a great membranous blood-tree being arose like a diseased dawn over the horizon, and beheld a massive scroll in its arms. With a single chorus from its lips, my men were reduced to ash and our stone walls melted into the earth beneath our feet."
-Melgan Yeyda, senior knight-captain