Riddlesmith

Whenever you cast an artifact spell, you may draw a card. If you do, discard a card.

Paradoxical Outcome

Return any number of target nonland, nontoken permanents you control to their owners' hands. Draw a card for each card returned to your hand this way.

Etherium Sculptor

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

Sai, Master Thopterist

Whenever you cast an artifact spell, create a 1/1 colorless Thopter artifact creature token with flying.
{1}{U}, Sacrifice two artifacts: Draw a card.

Reckless Fireweaver

Whenever an artifact you control enters, Reckless Fireweaver deals 1 damage to each opponent.

Jhoira, Weatherlight Captain

Whenever you cast a historic spell, draw a card. (Artifacts, legendaries, and Sagas are historic.)

Hurkyl's Recall

Return all artifacts target player owns to their hand.

Enthusiastic Mechanaut

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

Dramatic Reversal

Untap all nonland permanents you control.

Retract

Return all artifacts you control to their owner's hand.

Rebuild

Return all artifacts to their owners' hands.
Cycling {2} ({2}, Discard this card: Draw a card.)

Foundry Inspector

Filter Out

Return all noncreature, nonland permanents to their owners' hands.

Artificer's Assistant

Flying
Whenever you cast a historic spell, scry 1. (Artifacts, legendaries, and Sagas are historic. To scry 1, look at the top card of your library, then you may put that card on the bottom.)

Herald of Kozilek

Devoid (This card has no color.)
Colorless spells you cast cost {1} less to cast.