Thorn Mammoth

The fight is not the payload here; the trigger cadence is. Green has printed one-shot fight spells since Prey Upon and repeatable fighters since Ulvenwald Tracker, but stapling the fight to a creature-entry trigger turns every subsequent body you play into a removal spell. Cast this, and it clears an immediate blocker; then every dork, token, and midrange threat that follows fires it again, up to one target creature you don't control each time. A go-wide board doesn't just apply pressure, it methodically dismantles the opposing side one entry at a time, and the 6/6 trample body means the same creatures triggering the fights also finish the job. The design lever that keeps this from being oppressive is that it only fights creatures you don't control and fights only "up to one," so an empty opposing board leaves the ability doing nothing. That dependence on a live target is the constraint that pays for the engine: it wants you flooding the board while the opponent still has creatures worth killing, which is exactly the position a green flood deck struggles to guarantee. At seven mana it arrives late enough that the surrounding creatures often have to come first, but once it lands, each new arrival is a Prey Upon you didn't have to spend a card on.