Myr Retriever + Scrap Trawler + Blasting Station + Mycosynth Golem

Myr Retriever

Scrap Trawler

Blasting Station

Mycosynth Golem

How it works

1. Activate Blasting Station by tapping it and sacrificing Scrap Trawler.
2. When Scrap Trawler dies, it triggers, returning Myr Retriever from your graveyard to your hand.
3. Resolve the Blasting Station ability, dealing 1 damage to any target.
4. Cast Myr Retriever by paying 0.
5. When Myr Retriever enters the battlefield, Blasting Station triggers, untapping Blasting Station.
6. Activate Blasting Station by tapping it and sacrificing Myr Retriever.
7. When Myr Retriever dies, it triggers, returning Scrap Trawler from your graveyard to your hand.
8. Resolve the Blasting Station ability, dealing 1 damage to any target.
9. Cast Scrap Trawler by paying 0.
10. When Scrap Trawler enters the battlefield, Blasting Station triggers, untapping Blasting Station.
11. Repeat.