Mystery Booster/The List: Whir of Invention

Edition: Mystery Booster/The List
Type: Instant
Cast: X U U U
Rarity: R
Collector #: 049
Improvise (Your artifacts can help cast this spell. Each artifact you tap after you’re done activating mana abilities pays for {1}.)
Search your library for an artifact card with converted mana cost X or less, put it onto the battlefield, then shuffle your library.
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