Teshar, Ancestor's Apostle + Blasting Station + Kor Skyfisher

Teshar, Ancestor's Apostle

Blasting Station

Kor Skyfisher

How it works

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