Efficient Construction, Myr Retriever, Scrap Trawler, and Krark-Clan Ironworks

Prerequisites

• Efficient Construction on the battlefield
• Myr Retriever in the graveyard
• Scrap Trawler on the battlefield
• Krark-Clan Ironworks on the battlefield

Steps

1. Activate Krark-Clan Ironworks 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. Efficient Construction triggers, creating a 1/1 Thopter artifact creature token
5. Activate Krark-Clan Ironworks twice by sacrificing the Thopter and Myr Retriever, adding
6. When Myr Retriever dies, it triggers, returning Scrap Trawler from your graveyard to your hand
7. Cast Scrap Trawler by paying
8. Efficient Construction triggers, creating a 1/1 Thopter artifact creature token
9. Repeat

Results

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