Crypt Lurker

The 3/4 body is the tell here: this is a black common built to trade attrition for card advantage without ever asking you to build around it. The enter trigger folds two of black's oldest engines into one optional line, letting you either sacrifice a creature (turning a dying blocker or a spent token into a fresh card) or pitch a dead creature card from hand (turning a stranded threat into a live draw). Neither mode is mandatory, which is the quiet discipline of the design: with no valid fodder or nothing worth cashing in, you simply get a durable four-mana blocker and lose nothing. That makes it a floor-raiser rather than a payoff, the kind of unglamorous engine piece that fits any deck already generating creatures it doesn't mind spending. The 3/4 frame matters because it survives most early combat and blocks up the ground while the card it drew keeps the gas flowing, so the trade rarely leaves you worse off on the board than you were before. It is the recurring shape black gets to reprint at common: a body that outlasts small removal stapled to a graveyard-adjacent value trigger that rewards playing creatures you were happy to lose anyway.