Shepherd of the Cosmos, Bloodthrone Vampire, and Fungal Fortitude

Prerequisites

• Shepherd of the Cosmos on the battlefield
• Bloodthrone Vampire on the battlefield
• Fungal Fortitude on the battlefield

Steps

1. Activate Bloodthrone Vampire by sacrificing Shepherd of the Cosmos
2. When Shepherd of the Cosmos dies, Fungal Fortitude triggers, returning Shepherd of the Cosmos from your graveyard to the battlefield
3. When Shepherd of the Cosmos enters the battlefield, it triggers, returning Fungal Fortitude from your graveyard to the battlefield attached to Shepherd of the Cosmos
4. Resolve the Bloodthrone Vampire ability Repeat

Results

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