Shepherd of the Cosmos, Angelic Renewal, and Ashnod's Altar

Prerequisites

• Shepherd of the Cosmos on the battlefield
• Angelic Renewal on the battlefield
• Ashnod's Altar on the battlefield

Steps

1. Activate Ashnod's Altar by sacrificing Shepherd of the Cosmos, adding
2. Shepherd of the Cosmos dies, triggering Angelic Renewal, causing you to sacrifice Angelic Renewal and return Shepherd of the Cosmos from your graveyard to the battlefield
3. Shepherd of the Cosmos enters the battlefield, returning Angelic Renewal from your graveyard to the battlefield
4. Repeat

Results

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