Mortipede

Forcing every available blocker onto a single attacker is one of green's oldest combat tricks, a board-clearing setup that usually fed a separate trampler or sweeper. Stapling it to a cheap, expendable creature rather than an aura is the design move worth noticing. The body that carries the effect is a 4/1: four power forces enough chump-blocking to matter, and the lone toughness means it dies to almost anything it draws in, so the lure resolves once and the attacker rarely survives to repeat it. That fragility funds the effect instead of undercutting it. The sharper wrinkle is the color of the activation. A mono-black creature whose only ability demands can be cast but never activated in a mono-black deck; the card is functionally gold without printing a gold mana symbol, and works only in a shell that supports both halves of its mana requirement. That construction quietly enforces a two-color pairing through the activation cost alone, a tidy way to write color identity into the mechanics rather than the frame. Point it at a clogged board, every creature able to block does, and the single point of toughness guarantees it is a one-time clearing tool, with the green side of your manabase the cost of getting the door open at all.