Foundry Hornet

The conditional on the enters trigger is the whole design lever: a flying body that doubles as a one-sided debuff, but only if you already control a creature carrying a +1/+1 counter when it lands. That gating is what keeps a mono-black flyer from stapling a free board shrink onto its body. The counter is the entry fee, tying the card to a shell built to get counters down early, the counters-matters black deck that wants exactly this payoff on curve. When the condition is live, the -1/-1 clears a wall of x/1 tokens and softens everything larger, the precise swing an aggressive deck wants on a tempo turn. When it isn't, you have a 2/3 flyer and nothing more, and that all-or-nothing split is the honest cost of the printing. Because the debuff hits only opposing creatures, it functions as combat math and a way to push damage through in the air, not a removal spell you can aim. Note the shape of the payoff: it fires once, when the creature enters, not as a repeatable engine, so the reward is front-loaded into a single resolution. It asks you to assemble the board state before this hits the table, which is the design's way of pricing a board-shrinking enters trigger behind setup that has to happen first.