Guan Yu, Sainted Warrior, Remembrance, Deathrender, and Altar of Dementia

Prerequisites

• Guan Yu, Sainted Warrior on the battlefield
• Remembrance on the battlefield
• Deathrender on the battlefield
• Altar of Dementia on the battlefield
• All permanents on the battlefield
• Deathrender attached to Guan Yu

Steps

1. Activate Altar of Dementia by sacrificing Guan Yu
2. When Guan Yu dies, it, Deathrender and Remembrance trigger
3. Resolve the Guan Yu trigger, causing you to shuffle it into your library from your graveyard
4. Resolve the Remembrance trigger, causing you to search your library for Guan Yu and put it into your hand
5. Resolve the Deathrender trigger, putting Guan Yu from your hand onto the battlefield, and attaching Deathrender to it
6. Resolve the Altar of Dementia ability, causing target player to mill cards equal to Guan Yu's power
7. Repeat

Results

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