Altar of Dementia, Reincarnation, and Dualcaster Mage

Prerequisites

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

Steps

1. Cast Reincarnation by paying its mana cost
2. Holding priority, cast Dualcaster Mage by paying its mana cost
3. When Dualcaster Mage enters, it triggers, copying Reincarnation, with the copy targeting Dualcaster Mage
4. Resolve the copy of Reincarnation
5. Holding priority, activate Altar of Dementia by sacrificing Dualcaster Mage
6. When Dualcaster Mage dies, Reincarnation triggers, returning Dualcaster Mage from your graveyard to the battlefield
7. Repeat from step 3
8. Resolve all Altar of Dementia abilities from step 5

Results

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