Galvanic Iteration is a rare Instant card from Innistrad: Midnight Hunt Promos (PMID), collector number 224p. Current market price: $0.50 (foil $1.00), TCGplayer market prices via Scryfall.
When you next cast an instant or sorcery spell this turn, copy that spell. You may choose new targets for the copy. Flashback {1}{U}{R} (You may cast this card from your graveyard for its flashback cost. Then exile it.)