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5 Display Windows & Dual-Use Magnetic Lid Showcase your prized MTG Commanders or rare land cards in 5 built-in display windows for instant visual access

Xyz Monsters usually require their controller to detach (send to the Graveyard) the Xyz Materials to use their own effects, but they may have additional Xyz Materials attached to them with other card effects

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But in general, I'd run back Mono-Blue Mill exactly as it is

A free spell as long as you control your commander, it's not too flashy but its reliable , which is an important quality for a fog effect