Morophon, the Boundless, Worldheart Phoenix, and Altar of Dementia

Prerequisites

• Morophon, the Boundless on the battlefield
• Worldheart Phoenix on the battlefield
• Altar of Dementia on the battlefield
• "Phoenix" chosen with Morophon

Steps

1. Activate Altar of Dementia by sacrificing Worldheart Phoenix, causing target player to mill cards equal to Worldheart Phoenix's power
2. Cast Worldheart Phoenix from your graveyard by paying
3. Repeat

Results

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