Harness the Storm is a rare Enchantment card from Shadows over Innistrad (SOI), collector number 163. Current market price: $0.34 (foil $0.70), TCGplayer market prices via Scryfall.
Whenever you cast an instant or sorcery spell from your hand, you may cast target card with the same name as that spell from your graveyard. (You still pay its costs.)