Ixidron

Morph was built so each player chose the moment to flip their own creatures face up: this design seizes that choice and revokes it from everyone at once. As it enters, every other nontoken creature on the board turns face down into an anonymous 2/2, voiding the abilities, keywords, and creature types that made each one matter. The bodies stay; only the identities go dark. That is the tension it resolves: a board-state reset that kills nothing, so it slips past death triggers, "when this dies" insurance, and indestructibility while still neutralizing a field of bombs. Counters already on those creatures survive (face-down status does not strip them), but the printed text that justified them is gone. The cruelty is in the permanence: a creature with a real morph cost can pay to flip itself up, but a normal creature flipped down by this has no morph cost to pay, so it stays a blank 2/2 unless something else turns it face up. The symmetry is only as fair as your opponents' ability to unmorph, and most boards built on enters-the-battlefield value and layered triggers simply have no answer. Its own body scales to the wreckage it makes: against a wide field it becomes enormous; against a single other creature it arrives as a 1/1, smaller than the lone 2/2 it just created. The Illusion that erases other Illusions, it turns morph's quiet bluffing language into a unilateral act of forgetting.