Whenever Scrap Trawler or another artifact you control is put into a graveyard from the battlefield, return to your hand target artifact card in your graveyard with lesser converted mana cost.
NM-Mint - $3.80
Lightly Played - $3.60
Moderately Played - $3.40
Heavily Played - $3.00
Damaged - $2.50
NM-Mint Non English - $3.80
Lightly Played Non English - $3.60
Moderately Played Non English - $3.40
Heavily Played Non English - $3.00
Damaged Non English - $2.50