Rebuilt from Scraps

Exile three artifact cards from your graveyard,
return target artifact with total mana cost less
than or equal to the total mana cost of the
cards exiled by Rebuilt from Scraps.
One of the BATs began to remove parts from
an immobilized HISS Tank, I turned an asked,
Hotwire did you add that line of code to the
operating system, no is all he replied...
- Dr. Mindbender