Sawtusk Demolisher

Green already has some of the best noncreature removal in the game, but almost all of it is one-and-done: Naturalize casts once, Beast Within trades a card for a permanent and a token, and that is the transaction. What mutate does here is convert that Beast Within-style effect (destroy any noncreature permanent, hand the controller a 3/3 in return) into a trigger that can fire more than once from the same slot. Cast it hard as a 6/6 trampler and the destruction happens on the mutate that never comes; cast it for its mutate cost onto an existing non-Human body and it fires immediately, and every subsequent mutate onto that same pile fires it again. Stack a couple of mutating creatures over one base and each layer that resolves is another permanent gone. The 3/3 token is the color-pie courtesy that has traveled with this effect since Beast Within: green gets to break the artifact or the planeswalker, but it replaces what it destroyed with a creature the victim keeps, which is why the destruction reads as fair rather than punitive. The design's real trick is folding a repeatable answer, a growing board, and a trampling threat into a single mutate pile, using a keyword built precisely for the oddity of piling non-Human creatures into one stat line.