Metamorphosis Fanatic, Werefox Bodyguard, and Yahenni, Undying Partisan

Prerequisites

• Metamorphosis Fanatic in hand
• Werefox Bodyguard 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 Werefox Bodyguard from your graveyard to the battlefield
3. When Werefox Bodyguard enters, it triggers, exiling Metamorphosis Fanatic until Werefox Bodyguard leaves the battlefield
4. Activate Yahenni by sacrificing Werefox Bodyguard
5. When Werefox Bodyguard leaves the battlefield, Metamorphosis Fanatic is returned 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