Null Rod is a critical answer here, shutting off Grim Monolith's untap ability, Manifold Key, Mystic Forge's {T}, pay 1 life exile ability (its static permission to cast artifact and colorless spells from the top of the library is unaffected), and The One Ring's draw ability, crippling much of their artifact combo engine. Surgical Extraction can exile key artifact pieces like Lotus Petal or a milled/discarded combo piece to deny redundancy. Static Prison only temporarily exiles one permanent and they have many artifact threats to rebuild with, while Hexing Squelcher's counter-protection doesn't matter since this deck has no countermagic. Prioritize Wasteland on their many nonbasic utility lands like Urza's Saga and Ancient Tomb to slow their mana development.