Whir of Invention 49 (The List Reprints)

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.

NM - $12.30
LP - $9.90
MP - $7.40
HP - $5.00
DMG - $2.50