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 - $0.40
NM-Mint Non English - $0.40
Lightly Played - $0.40
Lightly Played Non English - $0.40
Moderately Played - $0.40
Moderately Played Non English - $0.40
Heavily Played - $0.30
Heavily Played Non English - $0.30
Damaged - $0.30
Damaged Non English - $0.30