Titanic Brawl

Green pays a tax for removing creatures by throwing its own at the problem: you spend the card, you risk your creature, and you get nothing if your creature loses the exchange. This one attaches a discount to the exact deck that makes the fight math trivial. Point it at a creature already carrying a +1/+1 counter and the cost drops to a single green mana, which turns removal into an afterthought in any deck built to stack counters. That conditional is the whole design: without a countered creature to target, it is a serviceable two-mana fight instant, but in a deck where your creatures grow past what they answer, it becomes the cheapest reliable removal green gets. The counter requirement does double duty as both discount trigger and reassurance that your fighter survives the trade, since a buffed creature is exactly the one that wins it. Instant speed matters more here than the sorcery-speed fight effects that came before: hold it through a declared block or attack and you convert a favorable combat step into a two-for-one, punishing an opponent who committed a creature expecting a clean trade. It rewards a specific build without demanding it, which is the honest sweet spot for a role-player: replaceable when the counters aren't there, quietly premium when they are.