Trigon of Corruption

A removal engine that arrives loaded rather than empty: it sits in play with a stockpile of activations already on it, and from there it slowly grinds creatures down a point of toughness at a time. The structure is the interesting part. Each shot costs only generic mana and a tap, so the throttle on the engine is not mana but the counters themselves, and the recharge clause asks for a steep double-black tax to refill what you spend. That trade is deliberate: you can keep the Trigon firing indefinitely, but topping it back up costs more per counter than it should, so a deck either treats the starting load as a finite resource or commits real black mana to running it as a perpetual machine. The -1/-1 counters do work that ordinary repeatable pinging cannot, since they shrink toughness permanently and stack across activations, ganging up to kill larger creatures over several turns or wiping out a board of small tokens one at a time. As a colorless artifact, it carries that black-flavored attrition into shells with no business casting black spells, which is most of its appeal: a slow, inevitable answer to creatures that any deck can run and only a black-heavy deck can keep fueled forever. It rewards patience over tempo, and it punishes go-wide boards more cleanly than it handles a single fat threat.