Breaking // Entering, Altar of Dementia, and Dualcaster Mage

Prerequisites

• Breaking // Entering in hand
• Altar of Dementia on the battlefield
• Dualcaster Mage in hand
• available

Steps

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

Results

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