enchantment — room

unholy annex

at the beginning of your end step, draw a card. if you control a demon, each opponent loses 2 life and you gain 2 life. otherwise, you lose 2 life.

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ritual chamber

when you unlock this door, create a 6/6 black demon creature token with flying.

(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)