Sister Hospitaller, Umbral Collar Zealot, and Faceless Butcher

Prerequisites

• Sister Hospitaller in hand
• Umbral Collar Zealot on the battlefield
• Faceless Butcher in the graveyard
• available

Steps

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

Results

• Infinite LTB
• Infinite ETB
• Infinite sacrifice triggers
• Infinite death triggers
• Infinite lifegain triggers
• Infinite lifegain
• Infinite surveil 1