Chief of the Foundry

Other artifact creatures you control get +1/+1.

Voltaic Servant

At the beginning of your end step, untap target artifact.

Etherium Sculptor

Artifact spells you cast cost {1} less to cast.

Workshop Assistant

When Workshop Assistant dies, return another target artifact card from your graveyard to your hand.

Jhoira's Familiar

Flying
Historic spells you cast cost {1} less to cast. (Artifacts, legendaries, and Sagas are historic.)

Tinker

As an additional cost to cast this spell, sacrifice an artifact.
Search your library for an artifact card, put that card onto the battlefield, then shuffle.

Foundry Inspector

Forsaken Monument

Colorless creatures you control get +2/+2.
Whenever you tap a permanent for {C}, add an additional {C}.
Whenever you cast a colorless spell, you gain 2 life.