Name: Polluted Cistern Cost: 1B CMC: 7 Color: B CID: B Type: Enchantment -- Room Rules Text: Whenever one or more cards are put into your graveyard from your library, each opponent loses 1 life for each card type among those cards. (You may cast either half. That door unlocks on the battlefield. As a sorcery, you may pay the mana cost of a locked door to unlock it.) [This is half of the split card Polluted Cistern // Dim Oubliette.] Set/Rarity: Duskmourn: House of Horror Commander rare Legality: Legal in oathbreaker, Legal in duel, Legal in commander, Legal in vintage, Legal in legacy Price: $0.33