Teshar, Ancestor's Apostle + Blasting Station + Glint Hawk

Teshar, Ancestor's Apostle

Blasting Station

Glint Hawk

How it works

1. Cast an artifact in your hand by paying 0.
2. Teshar triggers, returning Glint Hawk from your graveyard to the battlefield.
3. When Glint Hawk enters, it and Blasting Station trigger.
4. Resolve the Blasting Station trigger, untapping it.
5. Resolve the Glint Hawk trigger, returning another artifact that can be cast for 0 from the battlefield to your hand.
6. Resolve the artifact spell cast in step 1.
7. Activate Blasting Station by tapping it and sacrificing Glint Hawk.
8. Repeat.