Encroaching Mycosynth, Dualcaster Mage, Triumphant Reckoning, and Altar of Dementia

Prerequisites

• Encroaching Mycosynth on the battlefield
• Dualcaster Mage in hand
• Triumphant Reckoning in hand
• Altar of Dementia on the battlefield
• available

Steps

1. Cast Triumphant Reckoning by paying
2. In response, cast Dualcaster Mage by paying
3. Dualcaster Mage enters the battlefield, copying Triumphant Reckoning
4. Activate Altar of Dementia by sacrificing Dualcaster Mage, causing any player to mill two cards
5. Resolve a copy of Triumphant Reckoning, returning all nonland permanent cards from your graveyard to the battlefield
6. Repeat from step 3

Results

• Infinite death triggers
• Infinite ETB
• Infinite LTB
• Infinite magecraft triggers
• Infinite mill
• Infinite sacrifice triggers
• Infinite self-mill
• Put all nonland permanents in your graveyard and library onto the battlefield