Curious Colossus

White does not usually get to delete a creature this thoroughly. Removal in the color deals in exile, in tapping, in walling threats behind blockers; wholesale stat-and-ability erasure has historically been the province of blue's polymorph effects and black's stripping magic. This one folds all of it into a single trigger and points it at every creature an opponent controls at once, turning their entire board into a row of vanilla 1/1 Cowards with no keywords, no activated abilities, and no triggers. The finality of it lives in the "becomes a Coward" clause: this is not a temporary shrink but a rewrite of what each creature is, so a hexproof commander, a menace beater, and an indestructible enchantment-creature all end up as the same defenseless body until they leave and return. What keeps a mass neutering this comprehensive in check is the seven-mana price and the fact that it resets identity, not consequence: tokens already on the field stay, counters already placed remain, and it does nothing about the etch of damage already dealt. The 7/7 attached is almost incidental, a body large enough to punish the shrunken board on the crackback. The window a pilot has to respect is that the ability fires on entry only and targets nothing afterward, so anything an opponent deploys the following turn walks in at full size while the Colossus stares at a board it can no longer touch.