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It has the forges, warehouses, and factories, as well as the family that built the city into the miles-high magnificence that it is

There is also a big chance that it will see play in the current Mono-Blue Devotion decks in Standard, Pioneer, and Modern

But they both "replace" themselves in terms of mana, making for easy ramp, and can be traded for another card at any point in the game (ideally once the field is full of other artifacts)

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I feel that they are all playable and really good inclusions in your mono white decks interaction selection