Urtet, Remnant of Memnarch + Krark-Clan Ironworks + Workshop Assistant + Myr Retriever

Urtet, Remnant of Memnarch

Krark-Clan Ironworks

Workshop Assistant

Myr Retriever

How it works

1. Activate Krark-Clan Ironworks by sacrificing Workshop Assistant, 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. 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 Workshop Assistant from your graveyard to your hand.
7. Cast Workshop Assistant by paying 3.
8. Repeat.
9. Once you have infinite colorless mana, you may forego sacrificing the Myr tokens.