Whir of Invention
Instant{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.
Colour identity Blue · Improvise
In short
Whir of Invention has 7 listed printings; the most valuable is the Borderless · Special Guest · First-Place Foil printing from SPG at US$63.26 on TCGplayer's market price. Prices below are the cheapest in-stock listing in the United States.
Every Whir of Invention printing
Borderless · Special Guest · First-Place Foil
Whir of Invention
SPG · 96
TCGplayer market
US$63.26
Prerelease
Whir of Invention
PAER · 49s
TCGplayer market
US$18.77
Secret Lair
Whir of Invention
SLD · 311
TCGplayer market
US$9.30
Borderless · Special Guest
Whir of Invention
SPG · 86
TCGplayer market
US$8.91
Promo Pack
Whir of Invention
PAER · 49p
TCGplayer market
US$6.81
The List
Whir of Invention
PLST · AER-49
TCGplayer market
US$5.55
Whir of Invention
AER · 49
TCGplayer market
US$5.20