Mana Rig
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The Mana Rig was a complex of structures in Shiv built by the Thran.
It is found by Urza during the events of Urza's Legacy. He manages to get the Goblins and Viashino to work together to operate the Rig. It produced ]]Thran metal]] for the Skyship Weatherlight as well as a powerstone in which the mana from Serra's Realm would later be stored.