Infernal Vessel, Valkyrie's Call, and Altar of Dementia

Prerequisites

• Infernal Vessel on the battlefield
• Valkyrie's Call on the battlefield
• Altar of Dementia on the battlefield

Steps

1. Activate Altar of Dementia 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 Altar of Dementia ability
4. Activate Altar of Dementia 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 Altar of Dementia ability
7. Repeat

Results

• Infinite LTB
• Infinite ETB
• Infinite sacrifice triggers
• Infinite death triggers
• Infinite mill
• Infinite self-mill