Shepherd of the Cosmos, Kaya's Ghostform, and Hammerhead, Maggia Boss

Prerequisites

• Shepherd of the Cosmos on the battlefield
• Kaya's Ghostform on the battlefield
• Hammerhead, Maggia Boss on the battlefield

Steps

1. Activate Hammerhead 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, it triggers, returning Kaya's Ghostform from your graveyard to the battlefield attached to Shepherd of the Cosmos Resolve the Hammerhead ability
4. Repeat
5. Activate Hammerhead by sacrificing Shepherd of the Cosmos
6. When Shepherd of the Cosmos dies, Kaya's Ghostform triggers, returning Shepherd of the Cosmos from your graveyard to the battlefield
7. 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
8. Resolve the Hammerhead ability Repeat

Results

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