Efficient Construction + Myr Retriever + Junk Diver + Ashnod's Altar

Efficient Construction

Myr Retriever

Junk Diver

Ashnod's Altar

How it works

1. Activate Ashnod's Altar by sacrificing Junk Diver, adding CC.
2. When Junk Diver dies, it triggers, returning Myr Retriever from your graveyard to your hand.
3. Cast Myr Retriever by paying 2.
4. Efficient Construction triggers, creating a 1/1 Thopter artifact creature token.
5. Activate Ashnod's Altar twice by sacrificing the Thopter and Myr Retriever, adding CCCC.
6. When Myr Retriever dies, it triggers, returning Junk Diver from your graveyard to your hand.
7. Cast Junk Diver by paying 3.
8. Efficient Construction triggers, creating a 1/1 Thopter artifact creature token.
9. Repeat.

This delightful loop relies on Ashnod's Altar to continuously convert your mechanical scrap into a surging reservoir of colorless mana. By alternating the deaths of Junk Diver and Myr Retriever, each recursion pays the casting cost of the other while generating extra fuel through Ashnod's Altar's sacrifice mechanic. Meanwhile, Efficient Construction watches your artifact spells hit the stack and rewards you with an endless swarm of flying Thopter tokens.