Enter the Dungeon is a rare Sorcery card from The List (Unfinity Foil Edition) (ULST), collector number 19. Current market price: — (foil $0.23), TCGplayer market prices via Scryfall.
Players play a Magic subgame under the table, starting at 5 life and using their libraries as their decks. The winner searches their library for two cards, puts those cards into their hand, then shuffles.