Requires

Encroaching Mycosynth must be on the battlefield. Dualcaster Mage must be in hand. Dance of the Manse must be in hand. Altar of Dementia must be on the battlefield. Mana needed:

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