Name:Scrap Trawler
ManaCost:3
Types:Artifact Creature Construct
PT:3/2
T:Mode$ ChangesZone | Origin$ Battlefield | Destination$ Graveyard | ValidCard$ Card.Self | Execute$ TrigReturnArti | TriggerDescription$ Whenever CARDNAME 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. 
T:Mode$ ChangesZone | Origin$ Battlefield | Destination$ Graveyard | ValidCard$ Artifact.Other+YouCtrl | TriggerZones$ Battlefield | Secondary$ True | Execute$ TrigReturnArti | TriggerDescription$ Whenever CARDNAME 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. 
SVar:TrigReturnArti:DB$ ChangeZone | ValidTgts$ Artifact.cmcLTX+YouCtrl | Origin$ Graveyard | Destination$ Hand | References$ X
SVar:X:TriggeredCard$CardManaCost
SVar:Picture:http://www.wizards.com/global/images/magic/general/scrap_trawler.jpg
Oracle: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.