Encroaching Mycosynth, Dualcaster Mage, Dance of the Manse, and Altar of Dementia

Prerequisites

• Encroaching Mycosynth on the battlefield
• Dualcaster Mage in hand
• Dance of the Manse in hand
• Altar of Dementia on the battlefield
• available

Steps

1. Cast Dance of the Manse for X=3 or more by paying at least
2. In response, cast Dualcaster Mage by paying
3. Dualcaster Mage enters the battlefield, targeting Dance of the Manse with its triggered abiltiy
4. In response, activate Altar of Dementia by sacrificing Dualcaster Mage, causing any player to mill two cards
5. Resolve Dualcaster Mage's trigger, creating a copy of Dance of the Manse targeting Dualcaster Mage and any other valid targets
6. Resolve that copy, returning those cards from your graveyard to the battlefield
7. Repeat from step 3

Results

• Infinite death triggers
• Infinite ETB
• Infinite LTB
• Infinite magecraft triggers
• Infinite mill
• Infinite sacrifice triggers
• Infinite self-mill
• Put all nonland permanents below a certain mana value from your graveyard and library onto the battlefield