Brokkir, Lost Forge God

Whenever Brokkir or another artifact you control
is put into a graveyard from the battlefield,
return another target artifact card in your
graveyard to your hand with lesser mana value.
{r}, {t}: Create a scrap token.
You may return Brokkir from your graveyard to
your hand by exiling the top of your library until
you have exiled cards with mana value 7 or more.