Primus, the Inevitable

Primus costs {x} less to cast, where X is the
number of artifacts you control.
{1}, Exile an artifact card from your graveyard:
Create a 1/1 colorless construct creature token.
{2}, Sacrifice an artifact: Search your library for
an artifact card with converted mana cost less
than the sacrificed artifact's converted mana cost
and put it onto the battlefield.