Undercity Scavenger

The sacrifice clause is optional, and that permission is the whole design: eat something that has already done its job, and the payoff arrives all at once. Feed it a token, a decayed body, a creature whose enters-the-battlefield trigger you already banked, and the four-mana 3/3 becomes a 5/5 that also digs two cards deep to smooth the next draws. Left unfed, it stays a plain 3/3 with no floor, which is exactly the deal a sacrifice-matters deck signs up for. The scry stapled to the counters is the quiet part carrying the real weight: it turns the sacrifice from a pure board-count trade into card selection, pointing you toward the next threat or the next enabler right when you have just spent a resource to grow this one. Plenty of black creatures convert a death into raw stats; the information bundled onto the same trigger here is the wrinkle. It wants a graveyard-and-tokens shell that treats its own creatures as fuel rather than as permanent assets, and it asks nothing on the turns you have nothing to spare. A creature that grows itself by consuming another is one of black's oldest bargains; what this design adds is the knowledge you buy alongside the body.