Sun Titan, Altar of Dementia, and Necrogen Communion

Prerequisites

• Sun Titan on the battlefield
• Altar of Dementia on the battlefield
• Necrogen Communion on the battlefield

Steps

1. Activate Altar of Dementia by sacrificing Sun Titan
2. When Sun Titan dies, Necrogen Communion triggers, returning Sun Titan from your graveyard to the battlefield
3. When Sun Titan enters, it triggers, returning Necrogen Communion from your graveyard to the battlefield attached to Sun Titan
4. Resolve the Altar of Dementia ability
5. Repeat

Results

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