Sister Hospitaller, Wormfang Drake, and Yahenni, Undying Partisan

Prerequisites

• Sister Hospitaller in hand
• Wormfang Drake in the graveyard
• Yahenni, Undying Partisan on the battlefield
• available

Steps

1. Cast Sister Hospitaller by paying
2. When Sister Hospitaller enters, it triggers, returning Wormfang Drake from your graveyard to the battlefield and causing you to gain life equal to its mana value
3. When Wormfang Drake enters, it triggers, exiling Sister Hospitaller
4. Activate Yahenni by sacrificing Wormfang Drake
5. When Wormfang Drake dies, it triggers, returning Sister Hospitaller from exile to the battlefield
6. Repeat from step 2
7. Resolve all Yahenni abilities

Results

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