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Whir of Invention [Aether Revolt]
$4.20
Set: Aether Revolt Type: Instant Rarity: Rare 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.
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