Infernal Vessel + Valkyrie's Call + Carrion Feeder

Infernal Vessel

Valkyrie's Call

Carrion Feeder

How it works

1. Activate Carrion Feeder 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 Carrion Feeder ability.
4. Activate Carrion Feeder by sacrificing Infernal Vessel.
5. When Infernal Vessel dies, Valkyrie's Call triggers, returning Infernal Vessel from your graveyard to the battlefield as an Angel in additional to its other types.
6. Resolve the Carrion Feeder ability.
7. Repeat.