Break Down the Door is a uncommon Instant card from Duskmourn: House of Horror (DSK), collector number 170. Current market price: $0.23 (foil $0.25), TCGplayer market prices via Scryfall.
Choose one — • Exile target artifact. • Exile target enchantment. • 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.)