Sister Hospitaller, Phyrexian Altar, and Faceless Butcher

Prerequisites

• Sister Hospitaller in hand
• Phyrexian Altar 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 Phyrexian Altar by sacrificing Faceless Butcher
5. When Faceless Butcher dies, it triggers, returning Sister Hospitaller from exile to the battlefield
6. Repeat from step 2

Results

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