Volrath's Dungeon is a rare Enchantment card from The List (PLST), collector number EXO-78. Current market price: $0.30, TCGplayer market prices via Scryfall.
Pay 5 life: Destroy this enchantment. Any player may activate this ability but only during their turn. Discard a card: Target player puts a card from their hand on top of their library. Activate only as a sorcery.