Daretti, Scrap Savant

{t}Discard up to two cards, then draw that many cards.
{r}{r},{t}Sacrifice an artifact. If you do, return target artifact card from your graveyard to the battlefield.
If you have 30 artifacts then 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."