Saffi Eriksdotter, Shepherd of the Cosmos, and Bloodthrone Vampire

Prerequisites

• Saffi Eriksdotter on the battlefield
• Shepherd of the Cosmos on the battlefield
• Bloodthrone Vampire on the battlefield

Steps

1. Activate Saffi by sacrificing it, targeting Shepherd of the Cosmos Activate Bloodthrone Vampire 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. Resolve the Bloodthrone Vampire ability
4. Repeat

Results

• Infinite creature ETB
• Infinite creature LTB
• Infinite death triggers
• Infinitely large creature until end of turn