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Whir of Invention (49) [Aether Revolt]
$7.45
Aether Revolt
Instant
rare
{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 mana value X or less, put it onto the battlefield, then shuffle.