how do room cards work mtg Duskmourn: House of Horror Release Notes How do we think rooms

It requires a tapped creature in play, its a sorcery-only activation, and it costs mana to use, but the ability is all upside on a Seaside Citadel, and huge upside at that

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These are cards you can play in a mono-white Commander deck, which means Im excluding white cards that have additional colors in their color identity, like Dismantling Blow or Lantern Flare

The Bridge in the graveyard has no controller, however, its triggers have

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Being colorless hurts it a bit for this ranking, much like Golden Argosy, but more decks can utilize The Regalia in context