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 - $0.90
NM-Mint Non English - $0.90
Lightly Played - $0.90
Lightly Played Non English - $0.90
Moderately Played - $0.90
Moderately Played Non English - $0.90
Heavily Played - $0.80
Heavily Played Non English - $0.80
Damaged - $0.60
Damaged Non English - $0.60