Metamorphosis Fanatic, Faceless Butcher, and Yahenni, Undying Partisan

Prerequisites

• Metamorphosis Fanatic in hand
• Faceless Butcher in the graveyard
• Yahenni, Undying Partisan on the battlefield
• 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 Yahenni 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 Yahenni abilities

Results

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