MTGInstant
Whir of Invention
Rare{X}{U}{U}{U}
Aether Revolt (AER)
Market price by printingCurrent & per-set prices are free
$5.84
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See Premium →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 mana value X or less, put it onto the battlefield, then shuffle.