Urza continues to build a collection of artifacts and a skyship that will defeat the Phyrexian invasion. With the assistance of his student Jhoira and Karn, the silver golem, Urza surveys the Thran Mana Rig in Shiv and uncovers its primary purpose. While he is away, the people of his Tolarian Academy have to battle a Phyrexian infestation on the island itself.