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Rooms were cards in that deck

This means that their opponents life total is almost secondary and an opponent is going to be able to take some damage to deny card advantage fairly easily

You only need other creatures to make it good, which is trivially easy for most Limited decks

Then I thought about an ability that destroyed artifacts and created mana

Basic landcycling ( , Discard this card: Search your library for a basic land card, reveal it, put it into your hand, then shuffle.) Land Color tag templates(None) Command Tower : Add one mana of any color in your commander's color identity

The exiled card returns to the battlefield immediately after Faith Unbroken leaves the battlefield