Urtet, Remnant of Memnarch + Ashnod's Altar + Junk Diver + Myr Retriever

Urtet, Remnant of Memnarch

Ashnod's Altar

Junk Diver

Myr Retriever

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. Urtet's first ability triggers, creating a 1/1 Myr artifact creature token.
5. Activate Ashnod's Altar 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.

This elegant loop relies on an endless recycling relay between Junk Diver and Myr Retriever, using Ashnod's Altar to sacrifice them for the exact mana needed to recast whichever one just hit the graveyard. As those artifacts cycle back and forth, Urtet, Remnant of Memnarch triggers off each cast to flood your board with a growing army of Myr tokens. Once you have successfully generated infinite colorless mana, you can stop sacrificing your tokens and keep casting spells to reap an unbounded storm count and endless enters-the-battlefield triggers.