Urtet, Remnant of Memnarch + Krark-Clan Ironworks + Scrap Trawler + Myr Retriever

Urtet, Remnant of Memnarch

Krark-Clan Ironworks

Scrap Trawler

Myr Retriever

How it works

1. Activate Krark-Clan Ironworks by sacrificing Scrap Trawler, adding CC.
2. When Scrap Trawler dies, it triggers, returning Myr Retriever from your graveyard to your hand.
3. Cast Myr Retriever by paying 2.
4. Urtet's first ability triggers, creating a 1/1 Myr artifact creature token.
5. Activate Krark-Clan Ironworks twice by sacrificing Myr Retriever and the Myr token, adding CCCC.
6. When Myr Retriever dies, it triggers, returning Scrap Trawler from your graveyard to your hand.
7. Cast Scrap Trawler by paying 3.
8. Repeat.
9. Once you have infinite colorless mana, you may forego sacrificing the Myr tokens.

This looping engine creates an endless cycle of recycling and sacrifice by leveraging Scrap Trawler and Myr Retriever to constantly pull each other back from the graveyard. As you churn these artifacts through Krark-Clan Ironworks to generate a surplus of colorless mana, Urtet, Remnant of Memnarch effortlessly watches over the workshop, churning out an army of Myr tokens with every spell cast and standing ready to pump your entire mechanical horde.