Whir of Invention 49 (Aether Revolt)

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 - $7.30
LP - $5.90
MP - $4.40
HP - $3.00
DMG - $1.50