Scrap Trawler, Myr Retriever, Phyrexian Altar, and Ezzaroot Channeler

Prerequisites

• Scrap Trawler in the graveyard
• Myr Retriever on the battlefield
• Phyrexian Altar on the battlefield
• Ezzaroot Channeler on the battlefield

Steps

1. Activate Phyrexian Altar by sacrificing Myr Retriever, adding one mana of any color
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 Ezzaroot Channeler
4. Activate Phyrexian Altar by sacrificing Scrap Trawler, adding one mana of any color
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 Ezzaroot Channeler
7. Repeat

Results

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