Urtet, Remnant of Memnarch, Ashnod's Altar, Scrap Trawler, and Myr Retriever

Prerequisites

• Urtet, Remnant of Memnarch on the battlefield
• Ashnod's Altar on the battlefield
• Scrap Trawler on the battlefield
• Myr Retriever in the graveyard

Steps

1. Activate Ashnod's Altar by sacrificing Scrap Trawler, adding
2. When Scrap Trawler dies, it triggers, returning Myr Retriever from your graveyard to your hand
3. Cast Myr Retriever by paying
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
6. When Myr Retriever dies, it triggers, returning Scrap Trawler from your graveyard to your hand
7. Cast Scrap Trawler by paying
8. Repeat
9. Once you have infinite colorless mana, you may forego sacrificing the Myr tokens

Results

• Infinite colorless mana
• Infinite creature tokens
• Infinite death triggers
• Infinite ETB
• Infinite LTB
• Infinite sacrifice triggers
• Infinite storm count