Devil's Play is a rare Sorcery card from Duel Decks: Sorin vs. Tibalt (DDK), collector number 72. Current market price: $0.32, TCGplayer market prices via Scryfall.
Devil's Play deals X damage to any target. Flashback {X}{R}{R}{R} (You may cast this card from your graveyard for its flashback cost. Then exile it.)