Saffi Eriksdotter, Phyrexian Altar, and Shepherd of the Cosmos

Prerequisites

• Saffi Eriksdotter on the battlefield
• Phyrexian Altar on the battlefield
• Shepherd of the Cosmos on the battlefield

Steps

1. Activate Saffi by sacrificing it, targeting Shepherd of the Cosmos Activate Phyrexian Altar by sacrificing Shepherd of the Cosmos When Shepherd of the Cosmos dies, Saffi triggers, returning Shepherd of the Cosmos from your graveyard to the battlefield
2. When Shepherd of the Cosmos enters, it triggers, returning Saffi from your graveyard to the battlefield
3. Repeat

Results

• Infinite ETB
• Infinite LTB
• Infinite colored mana
• Infinite death triggers