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Introduced in Duskmourn: House of Horror , room enchantments are split cards that feature two separate rooms on each card, one of which can be cast at a time

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Witchcrafter Madame Verre X LIGHT Level 8 [ Spellcaster / Effect ] ATK 1000 DEF 2800 During damage calculation, if your Spellcaster monster battles an opponent's monster (Quick Effect): You can reveal any number of Spells with different names in your hand, and if you do, your battling monster gains 1000 ATK/DEF for each card revealed, until the end of this turn

Even Unown has its use cases in Expanded, serving as a pretty simple draw card