Jalira, Master Polymorphist

The activated ability folds the Polymorph effect into a repeatable engine, and the nonlegendary clause on the output is the cost that keeps it honest: every pull is restricted to ordinary creatures, so the legendary bombs and singleton combo pieces a transform deck might most want to cheat in are exactly what this cannot find. That steers the line away from the Eldrazi-titan jackpot and toward a creature-light shell stocked with one big nonlegendary payoff, where every body you could possibly hit is the one you meant to. The structure is the old one-shot transform line made permanent: sacrifice a token or a spent body, reveal until you reach a nonlegendary creature, and trade up. Where a single Polymorph spell asks you to clear your board first to guarantee the hit, this asks you to manufacture the fuel: a stream of expendable creatures becomes a recurring lottery. The 2/2 body is incidental; this is a tap-down value engine, not a beater, and the reactivation cost makes each pull a genuine investment rather than free. What sits the design a notch below the tightest Polymorph shells is the reveal itself: it surfaces the first nonlegendary creature from the top with no way to choose between two you happen to be running, which is precisely why the single-creature build is the natural home. It also serves as a flavor-forward face for the whole transform-a-creature line, a wizard who does on a clock what a spell does once.