Infernal Vessel + Luminous Broodmoth + Spawning Pit

Infernal Vessel

Luminous Broodmoth

Spawning Pit

How it works

1. Activate Spawning Pit by sacrificing Infernal Vessel.
2. When Infernal Vessel dies, it triggers, returning itself from your graveyard to the battlefield as a Demon in addition to its other types.
3. Resolve the Spawning Pit ability.
4. Activate Spawning Pit by sacrificing Infernal Vessel.
5. When Infernal Vessel dies, Luminous Broodmoth triggers, returning Infernal Vessel from your graveyard to the battlefield with a flying counter on it.
6. Resolve the Spawning Pit ability.
7. Repeat.