Colossal Grave-Reaver, Altar of Dementia, and Arashin Sovereign

Prerequisites

• Colossal Grave-Reaver on the battlefield
• Altar of Dementia on the battlefield
• Arashin Sovereign on the battlefield
• undefined

Steps

1. Activate Altar of Dementia by sacrificing Arashin Sovereign
2. When Arashin Sovereign dies, it triggers, putting itself from your graveyard onto the top of your library
3. Resolve the Altar of Dementia ability, causing you to mill cards equal to Arashin Sovereign's power, ultimately milling Arashin Sovereign
4. Colossal Grave-Reaver's second ability triggers, putting Arashin Sovereign from your graveyard onto the battlefield
5. Repeat

Results

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