Storm-Kiln Artist

This creature gets +1/+0 for each artifact you control.
Magecraft — Whenever you cast or copy an instant or sorcery spell, create a Treasure token. (It's an artifact with "{T}, Sacrifice this token: Add one mana of any color.")

Ichor Wellspring

When this artifact enters or is put into a graveyard from the battlefield, draw a card.

Mica, Reader of Ruins

Ward—Pay 3 life. (Whenever this creature becomes the target of a spell or ability an opponent controls, counter it unless that player pays 3 life.)
Whenever you cast an instant or sorcery spell, you may sacrifice an artifact. If you do, copy that spell and you may choose new targets for the copy.

Weapons Manufacturing

Whenever a nontoken artifact you control enters, create a colorless artifact token named Munitions with "When this token leaves the battlefield, it deals 2 damage to any target."