Chelonian Tackle

Green fight spells have always priced their removal in a fragile currency: to trade with a big creature, your creature has to survive the return blow, which means the trick only ever kills what your board can already outmuscle. The +0/+10 rewrites that math. Ten toughness for the turn means the fighter almost never dies to the retaliation, so the fight stops being a mutual gamble and becomes a one-sided kill: your creature deals its full power, takes whatever comes back, and shrugs it off. That flips the usual weakness of the mechanic. Where Prey Upon and its kin want you already ahead on stats, this asks only that your creature hit hard enough to finish the target, and lets most bodies absorb the counterpunch even with little toughness of their own. The toughness swing also stands on its own when the opponent has nothing worth fighting: the enemy creature is an "up to one" target, so you can skip the fight entirely and cast this as pure defense, hardening one of your creatures against a burn spell or a doomed combat. It remains a sorcery, so the whole exchange happens on your own turn, in the open, with no instant-speed ambush and no bluff to make in a blocking step. Within that narrow window, though, it does what green fight rarely manages cleanly: kill the thing you point at and keep your creature.