Shepherd of the Cosmos, Altar of Dementia, and Changing Loyalty

Prerequisites

• Shepherd of the Cosmos on the battlefield
• Altar of Dementia on the battlefield
• Changing Loyalty on the battlefield

Steps

1. Activate Altar of Dementia 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. Resolve the Altar of Dementia ability Repeat

Results

• Infinite ETB
• Infinite LTB
• Infinite death triggers
• Infinite mill
• Infinite sacrifice triggers
• Infinite self-mill