Polluted Cistern // Dim Oubliette

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.)

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When you unlock this door, mill three cards, then return a creature card from your graveyard to the battlefield.

(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.)