Devouring Strossus

A 9/9 flier with trample that bleeds out from underneath you if you stop feeding it. The upkeep sacrifice is the price tag: every turn you keep this on the table, you owe it a creature, and the moment you run out of bodies the engine eats itself. That same hunger doubles as armor, since the second sacrifice ability regenerates it at will, so removal that would otherwise kill an eight-mana investment just trades for one of your spare tokens instead. The design tension is honest and old-school: this is a payoff that demands an infrastructure of expendable creatures to support it, a top-end finisher that taxes the very board it dominates. It descends from a vein of early black fatties whose downside was a built-in tithe rather than a clause you could safely ignore, the kind of Phyrexian heavy that came with strings instead of a flat drawback. The numbers do real work here too: flying carries it over the ground stall and trample punishes chump blockers, so it closes games in a hurry, which is what justifies the upkeep clock. Build with a steady supply of fodder and the regeneration makes it nearly impossible to remove through combat or damage; build without it and the upkeep trigger becomes a countdown to your own concession.