Saffi Eriksdotter, Sister Hospitaller, and Yahenni, Undying Partisan

Prerequisites

• Saffi Eriksdotter on the battlefield
• Sister Hospitaller in hand
• Yahenni, Undying Partisan on the battlefield

Steps

1. Activate Saffi by sacrificing it, targeting Sister Hospitaller Activate Yahenni by sacrificing Sister Hospitaller When Sister Hospitaller dies, Saffi triggers, returning Sister Hospitaller from your graveyard to the battlefield
2. When Sister Hospitaller enters, it triggers, returning Saffi from your graveyard to the battlefield and causing you to gain 2 life
3. Resolve the Yahenni ability
4. Repeat

Results

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