Turn Inside Out is a common Instant card from Duskmourn: House of Horror (DSK), collector number 160. Current market price: $0.22 (foil $0.29), TCGplayer market prices via Scryfall.
Target creature gets +3/+0 until end of turn. When it dies this turn, manifest dread. (Look at the top two cards of your library. Put one onto the battlefield face down as a 2/2 creature and the other into your graveyard. Turn it face up any time for its mana cost if it's a creature card.)