Ancient Animus

Green's fight spells have always priced their reach into removal by putting your own creature into the math: you commit a body, resolve a mutual power exchange, and live with whatever survives on the other side. This one tilts the exchange before damage is dealt, but only for legendary creatures. The +1/+1 counter is conditional, applied first and only if the creature you control is legendary, so your legend enters the fight already a point bigger in both directions. That ordering does real work: it converts even trades into clean removal and lets a legend survive combat arithmetic it would have lost at base stats. Cast on a nonlegendary creature, it reverts to the ordinary green fight: two mana, mutual damage, and no help winning the power comparison. The design lives entirely on that legendary clause, which reads less like a build-around than a quiet incentive. It rewards you for owning powerful legends without demanding a deck constructed around them, and the payoff scales with how invested your board already is in legendary bodies. It is careful incentive design in a color that has printed variations on the fight effect for years: same skeleton, one extra line, and that line only pays out when you were already leaning the direction green wanted you to lean.