Miming Slime

Green's answer to the trample-and-stomp plan has always been to make one creature enormous, and this turns that whole investment into a second body of equal size. The math is the entire pitch: it reads off your biggest creature's power and clones that number onto a fresh Ooze, so a deck already committed to a fatty doubles its threat density without doubling its mana commitment. The dependency runs deep, though, because with no creatures in play the token arrives as a 0/0 and dies before you can blink. That prerequisite is the price tag: you pay once in mana and once in the requirement of already having a haymaker on the board, which is what stops it from reading as a generically efficient body. The cleverest interaction sits with anything that pumps power before you cast it, since the token's size locks in on resolution, not when the original creature was deployed; resolve a power boost first and the Ooze copies the inflated number. It is sorcery-speed, which rules out the ambush-blocker line and slots it firmly into the proactive midgame, where a green deck wants to convert a single fragile threat into a board that survives a removal spell. A doubler for the deck that has already won the size war, not a way to start it.