Karn's Archive

Whenever you cast an artifact spell, put a +1/+1 counter on Karn's Archive.
Remove X +1/+1 counters from Karn's Archive, {t}: search your library for an artifact card with converted mana cost X or less, reveal it, add it to
your hand, then shuffle your library. You may
cast the artifact without paying for its mana cost
this turn.
Partner with Yawgmoth's Device.