Infernal Vessel, Valkyrie's Call, and Viscera Seer

Prerequisites

• Infernal Vessel on the battlefield
• Valkyrie's Call on the battlefield
• Viscera Seer on the battlefield

Steps

1. Activate Viscera Seer 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 Viscera Seer ability
4. Activate Viscera Seer 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 Viscera Seer ability
7. Repeat

Results

• Infinite LTB
• Infinite ETB
• Infinite sacrifice triggers
• Infinite death triggers
• Infinite scry 1