Flusterstorm is a rare Instant card from Modern Horizons 3 (MH3), collector number 496. Current market price: — (foil $5.26), TCGplayer market prices via Scryfall.
Counter target instant or sorcery spell unless its controller pays {1}. Storm (When you cast this spell, copy it for each spell cast before it this turn. You may choose new targets for the copies.)