Fourth Bridge Prowler

The black answer to the white pump-and-poke common: a one-drop body that drags a single point of toughness off an enemy creature when it lands. The -1/-1 is the workhorse part. It clears the X/1 dorks and one-toughness fliers that fair aggro decks lean on, it shrinks a blocker just enough to let your team through, and it can finish a creature already nicked by combat or another spell. The "may" clause carries a lot of quiet upside: with no legal target, or no target worth shrinking, the trigger does nothing and you still keep a warm body on the board, so the card never sits dead in your hand the way a hard removal spell can. What pays for the flexibility is the size of the effect. One point of toughness is a narrow window; against anything with two or more, the Prowler is just a 1/1 that traded its enters trigger for a shrug. It is built for the floor of a curve, not the top of one: a creature that trades up against the smallest threats while still developing your own board, which is exactly the job a black aggressive or attrition deck wants from its cheapest slot.