Scrap Trawler, Myr Retriever, Krark-Clan Ironworks, and Helm of Awakening

Prerequisites

• Scrap Trawler in the graveyard
• Myr Retriever on the battlefield
• Krark-Clan Ironworks on the battlefield
• Helm of Awakening on the battlefield

Steps

1. Activate Krark-Clan Ironworks by sacrificing Myr Retriever, adding
2. When Myr Retriever dies, it triggers, returning Scrap Trawler from your graveyard to your hand
3. Cast Scrap Trawler by paying its mana cost, which is reduced by Helm of Awakening
4. Activate Krark-Clan Ironworks by sacrificing Scrap Trawler, adding
5. When Scrap Trawler dies, it triggers, returning Myr Retriever from your graveyard to your hand
6. Cast Myr Retriever by paying its mana cost, which is reduced by Helm of Awakening
7. Repeat

Results

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