Boxing Ring

The mana-value clause is the whole design puzzle here, and it cuts both ways. Tying each fight to a creature you don't control with the same mana value turns an open-ended removal engine into a matching game: your one-drops kill their one-drops, your bombs answer their bombs, and a board full of tokens fights nothing at all. That restriction is what keeps a repeatable, no-mana-cost fight enabler off the rails, and it rewards a deck built to hit specific rungs on the curve rather than one that just floods the board. The Treasure clause is the reward loop stapled on top: every turn you land a favorable fight, you bank ramp for the next haymaker, which nudges the engine toward decks that want to spend that mana on ever-larger creatures. It is a green fight payoff dressed as an artifact, sitting in a lineage that runs from Prey Upon and Ulvenwald Tracker through every "creatures enter, something dies" board-control piece green has leaned on, but the mana-value gate makes it a stranger, more surgical version of that idea: less a green removal battery than a mirror that answers threats in kind. Whether that reads as elegant or fiddly depends entirely on how tightly a deck's creature costs are packed against what it expects to fight.