Kaya's Ghostform, Brotherhood Outcast, and Bloodthrone Vampire

Prerequisites

• Kaya's Ghostform on the battlefield
• Brotherhood Outcast on the battlefield
• Bloodthrone Vampire on the battlefield

Steps

1. Activate Bloodthrone Vampire by sacrificing Brotherhood Outcast
2. When Brotherhood Outcast dies, Kaya's Ghostform triggers, returning Brotherhood Outcast from your graveyard to the battlefield
3. When Brotherhood Outcast enters, it triggers, returning Kaya's Ghostform from your graveyard to the battlefield attached to Brotherhood Outcast Resolve the Bloodthrone Vampire ability
4. Repeat
5. Activate Bloodthrone Vampire by sacrificing Brotherhood Outcast
6. When Brotherhood Outcast dies, Kaya's Ghostform triggers, returning Brotherhood Outcast from your graveyard to the battlefield
7. When Brotherhood Outcast enters the battlefield, it triggers, returning Kaya's Ghostform from your graveyard to the battlefield attached to Brotherhood Outcast
8. Resolve the Bloodthrone Vampire ability
9. Repeat

Results

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