Containment Priest is good since it exiles nontoken creatures that enter without being cast, blanking Goblin Engineer and Goblin Welder when they return artifact creatures like Phyrexian Dragon Engine to the battlefield. Consign to Memory counters their numerous colorless artifact spells like Mishra's Bauble, Lotus Petal, Mox Opal, and Urza's Bauble, while also hitting triggered abilities. Engineered Explosives set to 0 can sweep away Lotus Petal, Mox Opal, the Baubles, and the Construct tokens that Urza's Saga makes, though it can't touch Urza's Saga itself since it destroys only nonland permanents. Stifle is cut since we want to be proactive against their grindy artifact engine rather than reactive to activated abilities, and Erode is cut since their power lies in artifacts, which it can't answer, while their creatures are individually low-impact.