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Scale of Chiss-Goria and Tooth of Chiss-Goria are noncreature artifacts with Affinity for Artifacts, making it easier to cast Metalwork Colossus. Frogmite and Myr Enforcer also have Affinity for artifacts, giving you some earlier options for creatures. Expedition Map helps you assemble the Urza lands. Mourner's Shield isn't doing anything for you. You only have colourless cards, so the only damage it'll prevent is from colourless sources.
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