Sidisi, Regent of the Mire, Sister Hospitaller, Zealous Conscripts, and Bloodthrone Vampire

Prerequisites

• Sidisi, Regent of the Mire on the battlefield
• Sister Hospitaller in the graveyard
• Zealous Conscripts on the battlefield
• Bloodthrone Vampire on the battlefield

Steps

1. Activate Sidisi by tapping it and sacrificing Zealous Conscripts, returning Sister Hospitaller from your graveyard to the battlefield
2. When Sister Hospitaller enters the battlefield, it triggers, returning Zealous Conscripts from your graveyard to the battlefield and causing you to gain 5 life
3. When Zealous Conscripts enters the battlefield, it triggers, untapping Sidisi
4. Activate Bloodthrone Vampire by sacrificing Sister Hospitaller
5. Repeat

Results

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