Whir of Invention [Aether Revolt Promos]

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Set:	Aether Revolt Promos
Type:	Instant
Cost:	{X}{U}{U}{U}

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.