Requires

Dualcaster Mage must be in hand. Breaking // Entering must be in hand. Ashnod's Altar must be on the battlefield. There is at least one creature card in a graveyard. Mana needed:

Steps

1. Cast Entering by paying , targeting any creature card in a graveyard.
2. Holding priority, cast Dualcaster Mage by paying .
3. When Dualcaster Mage enters the battlefield, it triggers, targeting Entering.
4. Holding priority, activate Ashnod's Altar by sacrificing Dualcaster Mage, adding .
5. Resolve the Dualcaster Mage ability, creating a copy of Entering, targeting Dualcaster Mage.
6. Resolve the copy of Entering, returning Dualcaster Mage from your graveyard to the battlefield.
7. Repeat from step 3.
8. Optionally, you may cast both Breaking and Entering if you have an additional available to infinitely mill any number of players.

Results