Shepherd of the Cosmos, Goblin Bombardment, and Kaya's Ghostform

Prerequisites

• Shepherd of the Cosmos on the battlefield
• Goblin Bombardment on the battlefield
• Kaya's Ghostform on the battlefield

Steps

1. Activate Goblin Bombardment by sacrificing Shepherd of the Cosmos
2. When Shepherd of the Cosmos dies, Kaya's Ghostform triggers, returning Shepherd of the Cosmos from your graveyard to the battlefield
3. When Shepherd of the Cosmos enters the battlefield, it triggers, returning Kaya's Ghostform from your graveyard to the battlefield attached to Shepherd of the Cosmos
4. Resolve the Goblin Bombardment ability, dealing 1 damage to any target
5. Repeat

Results

• Infinite LTB
• Infinite ETB
• Infinite sacrifice triggers
• Infinite death triggers
• Infinite damage