Sister Hospitaller, Carrion Feeder, and Phantom Steed

Prerequisites

• Sister Hospitaller in hand
• Carrion Feeder on the battlefield
• Phantom Steed in the graveyard
• available

Steps

1. Cast Sister Hospitaller by paying
2. When Sister Hospitaller enters, it triggers, returning Phantom Steed from your graveyard to the battlefield and causing you to gain life equal to its mana value
3. When Phantom Steed enters, it triggers, exiling Sister Hospitaller until Phantom Steed leaves the battlefield
4. Activate Carrion Feeder by sacrificing Phantom Steed
5. When Phantom Steed leaves the battlefield, Sister Hospitaller is returned from exile to the battlefield
6. Repeat from step 2
7. Resolve all Carrion Feeder abilities

Results

• Infinite LTB
• Infinite ETB
• Infinite sacrifice triggers
• Infinite death triggers
• Infinite lifegain triggers
• Infinite lifegain
• Infinite +1/+1 counters on Carrion Feeder