Sidisi, Regent of the Mire, Sister Hospitaller, Zealous Conscripts, and Yahenni, Undying Partisan

Prerequisites

• Sidisi, Regent of the Mire on the battlefield
• Sister Hospitaller in the graveyard
• Zealous Conscripts on the battlefield
• Yahenni, Undying Partisan 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 Yahenni by sacrificing Sister Hospitaller
5. Repeat

Results

• Infinite LTB
• Infinite ETB
• Infinite sacrifice triggers
• Infinite death triggers
• Infinite lifegain triggers
• Infinite lifegain