Foundry Inspector

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

Myr Retriever

When Myr Retriever dies, return another target artifact card from your graveyard to your hand.

{T}, Sacrifice an artifact: Target player mills three cards.
Whenever an artifact enters, you may untap Grinding Station.

Flying
When Junk Diver dies, return another target artifact card from your graveyard to your hand.

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

Spells you cast cost {1} less to cast for each card with the same name as that spell in your graveyard.

Creature spells you cast cost {2} less to cast.
Creatures you control get -1/-1.

Whenever another permanent you control enters, each opponent mills a card.