Spawning Pit + Fiend Hunter + Angel of Indemnity

Spawning Pit

Fiend Hunter

Angel of Indemnity

How it works

1. Cast Fiend Hunter by paying its mana cost.
2. When Fiend Hunter enters, its first ability triggers, exiling Angel of Indemnity.
3. Activate Spawning Pit 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 Spawning Pit ability.
8. Repeat from step 3.