For each nonland permanent, choose a player at random. Then each player gains control of each permanent for which they were chosen. Untap those permanents.
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 mana value.
{T}, Sacrifice an artifact with mana value X: Return target artifact card with mana value less than X from your graveyard to the battlefield. It gains haste until end of turn.
"This big metal guy will make some amazing wind chimes!"
Scrapheap Scrounger can't block. {1}{B}, Exile another creature card from your graveyard: Return Scrapheap Scrounger from your graveyard to the battlefield.
Some machines refuse to accept their own obsolescence.
Flying When Screaming Seahawk enters the battlefield, you may search your library for a card named Screaming Seahawk, reveal it, put it into your hand, then shuffle.