Umbral Collar Zealot, Fiend Hunter, and Angel of Indemnity

Prerequisites

• Umbral Collar Zealot on the battlefield
• Fiend Hunter in hand
• Angel of Indemnity on the battlefield
• available

Steps

1. Cast Fiend Hunter by paying its mana cost
2. When Fiend Hunter enters, its first ability triggers, exiling Angel of Indemnity
3. Activate Umbral Collar Zealot by sacrificing Fiend Hunter
4. When Fiend Hunter dies, its second ability triggers, returning Angel of Indemnity from exile to the battlefield
5. When Angel of Indemnity enters, it triggers, returning Fiend Hunter from your graveyard to the battlefield
6. When Fiend Hunter enters, its first ability triggers, exiling Angel of Indemnity
7. Resolve the Umbral Collar Zealot ability
8. Repeat from step 3

Results

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