Orah, Skyclave Hierophant, Sister Hospitaller, Valiant Changeling, and Yahenni, Undying Partisan

Prerequisites

• Orah, Skyclave Hierophant on the battlefield
• Sister Hospitaller in the graveyard
• Valiant Changeling on the battlefield
• Yahenni, Undying Partisan on the battlefield

Steps

1. Activate Yahenni by sacrificing Valiant Changeling
2. When Valiant Changeling dies, Orah triggers, returning Sister Hospitaller from your graveyard to the battlefield
3. When Sister Hospitaller enters, it triggers, returning Valiant Changeling from your graveyard to the battlefield and causing you to gain 7 life
4. Resolve the Yahenni ability
5. Activate Yahenni by sacrificing Sister Hospitaller
6. When Sister Hospitaller dies, Orah triggers, allowing you to return a Cleric with mana value 5 or less from your graveyard to the battlefield
7. Resolve the Yahenni ability
8. Repeat

Results

• Infinite ETB
• Infinite LTB
• Infinite death triggers
• Infinite lifegain
• Infinite lifegain triggers
• Infinite recursion of some creature cards in your graveyard
• Infinite sacrifice triggers