Combat Celebrant, Adarkar Valkyrie, Anger, and Altar of Dementia

Prerequisites

• Combat Celebrant on the battlefield
• Adarkar Valkyrie on the battlefield
• Anger in the graveyard
• Altar of Dementia on the battlefield
• You control a Mountain

Steps

1. Activate Adarkar Valkyrie by tapping it, targeting Combat Celebrant
2. Declare Combat Celebrant as an attacker, choosing to exert it as it attacks
3. Combat Celebrant triggers, untapping all other creatures you control and causing you to get an additional combat phase after this one
4. Activate Altar of Dementia by sacrificing Combat Celebrant
5. Combat Celebrant dies, triggering Adarkar Valkyrie, returning Combat Celebrant from your graveyard to the battlefield
6. Resolve the Altar of Dementia ability, causing target player to mill cards equal to Combat Celebrant's power
7. Repeat

Results

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