Impossible Inferno is a common Instant card from Duskmourn: House of Horror (DSK), collector number 140. Current market price: $0.09 (foil $0.07), TCGplayer market prices via Scryfall.
Impossible Inferno deals 6 damage to target creature. Delirium — If there are four or more card types among cards in your graveyard, exile the top card of your library. You may play it until the end of your next turn.