Teysa Karlov, Scrap Trawler, Myr Retriever, and Krark-Clan Ironworks

Prerequisites

• Teysa Karlov on the battlefield
• Scrap Trawler in the graveyard
• Myr Retriever on the battlefield
• Krark-Clan Ironworks on the battlefield
• You control a nontoken artifact with mana value one or less that can be cast using only colorless mana

Steps

1. Activate Krark-Clan Ironworks twice by sacrificing the nontoken artifact with mana value one or less and Myr Retriever, adding
2. When Myr Retriever dies, its ability triggers twice, returning Scrap Trawler and the nontoken artifact with mana one or less to your hand from your graveyard
3. Cast Scrap Trawler and the nontoken artifact by paying at most
4. Activate Krark-Clan Ironworks twice by sacrificing the nontoken artifact and Scrap Trawler, adding
5. Scrap Trawler triggers twice for itself dying, and once for the nontoken artifact
6. Resolve the Scrap Trawler trigger for the nontoken artifact, returning any applicable artifact to your hand from your graveyard
7. Resolve the remaining Scrap Trawler triggers, returning the nontoken artifact and Myr Retriever to your hand from your graveyard
8. Cast the nontoken artifact and Myr Retriever by paying at most
9. Repeat

Results

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