Whir of Invention 311 (Secret Lair Drop Series)

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 - $15.50
LP - $12.40
MP - $9.30
HP - $6.20
DMG - $3.10