Metamorphosis Fanatic, Umbral Collar Zealot, and Lagrella, the Magpie

Prerequisites

• Metamorphosis Fanatic in hand
• Umbral Collar Zealot on the battlefield
• Lagrella, the Magpie in the graveyard
• available

Steps

1. Cast Metamorphosis Fanatic by paying
2. When Metamorphosis Fanatic enters, it triggers, returning Lagrella from your graveyard to the battlefield
3. When Lagrella enters, it triggers, exiling Metamorphosis Fanatic until Lagrella leaves the battlefield
4. Activate Umbral Collar Zealot by sacrificing Lagrella
5. When Lagrella leaves the battlefield, Metamorphosis Fanatic is returned 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