Metamorphosis Fanatic, Umbral Collar Zealot, and Faceless Butcher

Prerequisites

• Metamorphosis Fanatic in hand
• Umbral Collar Zealot on the battlefield
• Faceless Butcher in the graveyard
• available

Steps

1. Cast Metamorphosis Fanatic by paying
2. When Metamorphosis Fanatic enters, it triggers, returning Faceless Butcher from your graveyard to the battlefield
3. When Faceless Butcher enters, it triggers, exiling Metamorphosis Fanatic
4. Activate Umbral Collar Zealot by sacrificing Faceless Butcher
5. When Faceless Butcher dies, it triggers, returning Metamorphosis Fanatic 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 surveil 1