Daretti, Scrap Savant
{3}{R}
Legendary Planeswalker -- Daretti
3
[+2]: Discard up to two cards, then draw that many cards.
[-2]: Sacrifice an artifact. If you do, return target artifact card from your graveyard to the battlefield.
[-10]: You get an emblem with "Whenever an artifact is put into your graveyard from the battlefield, return that card to the battlefield at the beginning of the next end step."
~this~ can be your commander.
Transmute Artifact
{U}{U}
Sorcery
Sacrifice an artifact. If you do, search your library for an artifact card. If that card's mana value is less than or equal to the sacrificed artifact's mana value, put it onto the battlefield. If it's greater, you may pay {X}, where X is the difference. If you do, put it onto the battlefield. If you don't, put it into its owner's graveyard. Then shuffle.