Shepherd of the Cosmos, Phantom Train, and Fungal Fortitude

Prerequisites

• Shepherd of the Cosmos on the battlefield
• Phantom Train on the battlefield
• Fungal Fortitude on the battlefield

Steps

1. Activate Phantom Train 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 Phantom Train ability, putting a +1/+1 counter on it
5. Repeat

Results

• Infinite LTB
• Infinite ETB
• Infinite sacrifice triggers
• Infinite death triggers
• Infinite +1/+1 counters on a creature