Charged Mutasphere

You may have Charged Mutasphere enter the
battlefield as a copy of any artifact on the
battlefield, except it enters with X additional
charge counters on it.
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The Aevum are highly proud of their knowledge, and
it is directly reflected in their Grand Library. Directly
situated at the forefront, the mutasphere rests in
mid-air, changing the fabric of space-time itself to
house the endless number of leather-bounded books.