Infernal Vessel, Valkyrie's Call, and Bloodflow Connoisseur

Prerequisites

• Infernal Vessel on the battlefield
• Valkyrie's Call on the battlefield
• Bloodflow Connoisseur on the battlefield

Steps

1. Activate Bloodflow Connoisseur 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 Bloodflow Connoisseur ability
4. Activate Bloodflow Connoisseur 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 Bloodflow Connoisseur ability
7. Repeat

Results

• Infinite LTB
• Infinite ETB
• Infinite sacrifice triggers
• Infinite death triggers
• Infinite +1/+1 counters on Bloodflow Connoisseur