Blasphemous Act

The cost-reduction clause is the whole sleight of hand: nine mana on paper, but every creature on the battlefield shaves a generic off the bill, and on a board cluttered enough to need a wrath, the spell routinely comes down for a single red. The 13 is deliberately absurd, set high enough that it isn't a damage-based sweeper you build around so much as a hard reset: only a small set of creatures survive it without help, so for board-state purposes it reads as "destroy every creature" with a number attached. That number is also the only restriction. There's no exile, no indestructible clause, no protection for your own side; it hits each creature without discrimination, and the cost reduction counts your creatures too, which means it gets cheapest precisely when casting it costs you the most. The design lives in that tension between price and symmetry. Where a flat-cost board wipe asks whether you can afford the mana, this one asks whether you can afford the timing: it wants a glutted board to be efficient, but a glutted board is often one you helped build. Damage-based wrath also opens doors a destroy-effect closes, since redirecting a single instance of 13 damage at a creature with the right rider, or surviving it with a high-toughness body, turns a symmetrical reset into a one-sided one.