Irradiate

Removal that scales with your board: in an artifact-saturated deck, this shrinks a target by the size of your investment, and on a developed board it eats almost anything in a single shot. The wager is structural, the one any "count your permanents" effect makes: drawn on an empty board it does nothing, drawn with five artifacts down it puts a dragon in the graveyard and walks away. That swing from blank to overkill is the whole bet. What sets it apart from black's usual subtraction is the lack of a fixed number to play around: an opponent cannot size their creatures against a known -X/-X, because the X is whatever you have managed to assemble. Crucially, the toughness reduction is one of black's cleaner ways through an indestructible threat: drop a creature to 0 toughness and it dies as a state-based action, no destruction needed, so the keyword that shrugs off conventional removal does nothing here. The cost is steep for what it does in isolation, which is the price black pays for scaling removal that kills rather than merely nudges. It belongs squarely to the "your artifacts are a resource you spend twice" thesis of its era, doing the same structural work as the cards that count artifacts for damage or draw, only pointed at the opponent's board instead of your own engine.