Returned Reveler

Self-mill is normally a cost you pay reluctantly; here it is welded to a body that already wants to be in the way. The 1/3 is a wall first, surviving the early swings that a one-power blocker would die to and chumping the bigger ones, which means it spends most games waiting to die in a fight it was always going to lose. That death is the payoff: three cards into your own graveyard, free of any sacrifice tax, whether it fell in combat, ate a removal spell, or got fed to an outlet on purpose. For a black deck built to mine its own bin (delve costs, recursion targets, anything counting cards in the yard), that is a reliable stocking effect bolted onto a creature you were happy to lose anyway. The symmetry, each opponent milling three as well, is mostly incidental and occasionally a liability against a graveyard-hungry mirror, but it is not the engine; the engine is the trigger. This is graveyard-matters design in its quietest register: no marquee payoff, no build-around fanfare, just a cheap creature that turns its own inevitable death into fuel and asks for nothing up front.