Devious Cover-Up is a common Instant card from Innistrad: Double Feature (DBL), collector number 48. Current market price: $0.18 (foil $0.95), TCGplayer market prices via Scryfall.
Counter target spell. If that spell is countered this way, exile it instead of putting it into its owner's graveyard. You may shuffle up to four target cards from your graveyard into your library.