Polymorphous Rush is a rare Instant card from Journey into Nyx (JOU), collector number 46. Current market price: $0.21 (foil $0.38), TCGplayer market prices via Scryfall.
Strive — This spell costs {1}{U} more to cast for each target beyond the first. Choose a creature on the battlefield. Any number of target creatures you control each become a copy of that creature until end of turn.