Shepherd of the Cosmos, Thermopod, and Changing Loyalty

Prerequisites

• Shepherd of the Cosmos on the battlefield
• Thermopod on the battlefield
• Changing Loyalty on the battlefield

Steps

1. Activate Thermopod by sacrificing Shepherd of the Cosmos
2. When Shepherd of the Cosmos dies, Changing Loyalty triggers, returning Shepherd of the Cosmos from your graveyard to the battlefield
3. When Shepherd of the Cosmos enters the battlefield, it triggers, returning Changing Loyalty from your graveyard to the battlefield attached to Shepherd of the Cosmos
4. Repeat

Results

• Infinite creature ETB
• Infinite creature LTB
• Infinite death triggers
• Infinite red mana
• Infinite creature sacrifice triggers