Urtet, Remnant of Memnarch + Krark-Clan Ironworks + Junk Diver + Myr Retriever

Urtet, Remnant of Memnarch

Krark-Clan Ironworks

Junk Diver

Myr Retriever

How it works

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