Steelbane Hydra

Green has answered artifacts and enchantments on a creature body for years: Reclamation Sage, Acidic Slime, and Thrashing Brontodon all bolt a Disenchant onto a stat line you get to keep afterward. What this bends is the economy of those effects. Each of those creatures answers one permanent and then stands around as a vanilla body; the destruction is a one-time rider. Here the removal is metered against the same counters that make the body a threat. The X you pour in at cast time is both the size of the attacker and the ammunition: every activation strips a counter to destroy something, so each artifact or Oblivion Ring you answer permanently subtracts from the creature that answered it. There is no line that grows the counters back. A large X buys a real clock and several rounds of removal; a small X gives you a modest body with one or two shots before it whittles to nothing. That decay is the whole design. Where the instant-speed staples (Naturalize, Disenchant, and their endless reskins) trade one card for one permanent and leave the board empty, this converts a scaling threat into a repeatable answer and asks you to spend the threat down to buy each answer. The trade only ever runs one direction, and living inside that shrinking budget is more interesting than any single-use spell has to be.