Shepherd of the Cosmos, Thermopod, and Kaya's Ghostform

Prerequisites

• Shepherd of the Cosmos on the battlefield
• Thermopod on the battlefield
• Kaya's Ghostform on the battlefield
• Kaya's Ghostform attached to Shepherd of the Cosmos

Steps

1. Activate Thermopod's second ability by sacrificing Shepherd of the Cosmos, adding
2. When Shepherd of the Cosmos dies, Kaya's Ghostform triggers, returning Shepherd of the Cosmos from your graveyard to the battlefield
3. When Shepherd of the Cosmos enters the battlefield, it triggers, returning Kaya's Ghostform from your graveyard to the battlefield attached to Shepherd of the Cosmos
4. Repeat

Results

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