The MTG Unholy Annex/Ritual Chamber from Duskmourn: House of Horror is a rare black enchantment card in English, illustrated by Matteo Bassini. It has a cost of 2b / 3bb and is part of the Magic: The Gathering game by Wizards of the Coast. This card combines the abilities of Unholy Annex and Ritual Chamber, offering players a unique and powerful addition to their decks.