Thrashing Wumpus
Pestilence on a stick, and the body that turned a symmetrical sweeper into an engine. The activation hits every creature and every player for one, with no cap, so with enough black mana the board empties and the life totals fall in lockstep. The 3/3 frame is the whole trick: it survives its own pings longer than the average board, and with a toughness boost keeping it alive it becomes a one-card mass-removal loop that can close the game on its own. Black has always paid life for power, and few designs distill that bargain this cleanly, since each point dealt to the table is also a point off your own total unless you are buffering it somewhere. The lineage runs straight through Pestilence and Pestilence Demon: a damage faucet that punishes go-wide boards and grinds down opponents who cannot answer the creature itself. The difference here is structural; there is no enchantment upkeep tax and no separate card to maintain, because the damage lives on a creature that wants to be on the battlefield anyway. It rewards a deck built to drain opponents faster than it bleeds itself out, and it asks the pilot to track two totals at once, because the activation that wins the game and the activation that kills you are the same button pressed one time too many.
