Flip the Switch is a common Instant card from Innistrad: Double Feature (DBL), collector number 54. Current market price: $0.22 (foil $0.66), TCGplayer market prices via Scryfall.
Counter target spell unless its controller pays {4}. Create a 2/2 black Zombie creature token with decayed. (It can't block. When it attacks, sacrifice it at end of combat.)