Altar of Dementia, Continue?, and Dualcaster Mage

Prerequisites

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

Steps

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

Results

• Infinite recursion of creatures you control
• Infinite ETB
• Infinite LTB
• Infinite death triggers
• Infinite magecraft triggers
• Infinite mill
• Infinite sacrifice triggers
• Infinite self-mill