MTG Single

Whir of Invention (AER 49) [Aether Revolt]

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Set: Aether Revolt
Collector Number: 49
Rarity: Rare
Type: Instant
Mana 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 mana value X or less, put it onto the battlefield, then shuffle.

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