Graveyard Marshal
A 3/2 for two curves out like any aggressive black beater, but the body is a decoy for the real function: a mana sink that keeps grinding after the hand empties. Once games go long, the activated ability turns creature cards in your own graveyard (bodies that have already traded, fodder you sacrificed elsewhere) into tapped 2/2 Zombies one at a time. Two things keep this from spiraling. First, the exile cost makes every token permanent: each Zombie costs a creature card removed from your yard for good, so the supply is finite and shrinks with use rather than looping. Second, the tokens arrive tapped, so they cannot block the turn they are made; the ability is built for attrition and pressure, not instant defense. This is a familiar shape in aggressive black: the early drop that doubles as a late-game engine, giving flooded draws somewhere to dump mana and denying grindy opponents the stall they need. The Zombie typing is incidental to how the card actually works, but it slots cleanly into tribal payoffs, which is where the design finds its most natural homes.

