Feign Death, Dualcaster Mage, and Altar of Dementia

Prerequisites

• Feign Death in hand
• Dualcaster Mage in hand
• Altar of Dementia on the battlefield
• available

Steps

1. Cast Feign Death by paying , targeting any creature
2. Holding priority, cast Dualcaster Mage by paying
3. When Dualcaster Mage enters the battlefield, it triggers, creating a copy of Feign Death, targeting Dualcaster Mage
4. Resolve the copy of Feign Death
5. Activate Altar of Dementia by sacrificing Dualcaster Mage
6. When Dualcaster Mage dies, it triggers, returning itself from your graveyard to the battlefield tapped
7. Repeat from step 3
8. Resolve all Altar of Dementia abilities, causing any number of players to mill infinite cards

Results

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