Kapow!

Green's fight cards have always fought a rate problem: they hand your creature a removal spell, but the creature has to survive the exchange, and a bad trade turns your spell into a two-for-one against you. The counter is what tilts the math. Bumping the power of your creature before combat means the fight resolves in your favor more often, and unlike the pump spells that green has used for the same job, the buff is permanent. Your creature keeps the size after the smoke clears, which turns a piece of removal into a body that has grown. That is the quiet efficiency of stapling a growth effect to a fight: the same card that clears a blocker also advances the board it leaves behind. It descends from Prey Upon and Rabid Bite, the earlier fights that green used to trade up, but those cards spent their whole effect on the combat. Here the fight is only half the transaction; the counter is the part that stays. The design tension green fights has always carried, that removal should not be free in a color that pays for its interaction with combat risk, is answered by making the risk smaller rather than removing it, and letting the reward compound on the creature rather than the spell.