Witch-king, Bringer of Ruin
The edict most players know lets the defender choose which body dies, so they feed it the cheapest thing on the board without a thought; a wall of fodder is protection against Diabolic Edict precisely because the fodder is what gets eaten. This automates and repeats that math rather than overturning it: the attack trigger forces the defending player to sacrifice the least-power creature every combat, and only when several tie for lowest power does the defender pick among them. Because it compels a sacrifice rather than targeting a chosen creature, hexproof, shroud, and protection do nothing to save the weakest body. The 5/3 flier is the delivery mechanism, an edict welded to an evasive clock that grinds a board down one weakest creature at a time until it reaches the pieces you actually wanted, then keeps going. The timing window is the sharp part. The trigger resolves on attack declaration, before blocks are assigned, so it can strip a would-be chump-blocker while it is still standing back; leaving one creature home to eat the swing rarely works. Hold blockers and you feed the engine; empty your board and you take five in the air. The 3 toughness is the honest half of the deal, keeping something this relentless answerable to most removal and even some combat math, so the pressure has to close the game before the defender stabilizes.
