Exhume, Altar of Dementia, and Dualcaster Mage

Prerequisites

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

Steps

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

Results

• Infinite LTB
• Infinite ETB
• Infinite sacrifice triggers
• Infinite death triggers
• Infinite mill
• Infinite self-mill
• Infinite magecraft triggers
• Each opponent returns all creature cards from their graveyard to the battlefield