Whir of Invention
Instant
{X}{U}{U}{U}
Mana Cost
3.0
Mana Value
-
USD Price
mythic
Rarity
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 mana value X or less, put it onto the battlefield, then shuffle.