Kor Skyfisher

Flying
When Kor Skyfisher enters, return a permanent you control to its owner's hand.

Thraben Inspector

When Thraben Inspector enters, investigate. (Create a Clue token. It's an artifact with "{2}, Sacrifice this artifact: Draw a card.")

Court Homunculus gets +1/+1 as long as you control another artifact.

Metalcraft — Ardent Recruit gets +2/+2 as long as you control three or more artifacts.

Flying
When Glint Hawk enters, sacrifice it unless you return an artifact you control to its owner's hand.