(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.)
Derelict Attic
When you unlock this door, you draw two cards and you lose 2 life.
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Widow's Walk
Whenever a creature you control attacks alone, it gets +1/+0 and gains deathtouch until end of turn.
