屑鉄さらい
アーティファクト・クリーチャー — 構築物
屑鉄さらいかあなたがコントロールする他のアーティファクトが１つ戦場から墓地に置かれるたび、あなたの墓地から点数で見たマナ・コストがそれより小さいアーティファクト・カード１枚を対象とし、それをあなたの手札に戻す。
Illustrated by
Aether Revolt#175RareJapaneseLegality
Rulings
If Scrap Trawler and another artifact you control are put into a graveyard at the same time, Scrap Trawler’s ability triggers for each of them.
The target artifact card must have a lesser mana value than the artifact that caused Scrap Trawler’s ability to trigger by being put into a graveyard. Use the artifact’s mana value as it last existed on the battlefield to determine what may be returned.
While on the battlefield or in a graveyard, 
in an object’s mana cost is 0.
If an artifact is a copy of another artifact with greater mana value, such as Sculpting Steel copying an artifact with mana value 4, Scrap Trawler’s ability can target that artifact card in your graveyard when that artifact is put into your graveyard.