Name
Whir of Invention
Set Name
Aether Revolt
Set Type
Expansion
Mana
Type Line
Instant
Rarity
Rare
Oracle Text
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.