Phyrexian Altar + Breaking // Entering + Dualcaster Mage

Phyrexian Altar

Breaking // Entering

Dualcaster Mage

How it works

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 Phyrexian Altar by sacrificing Dualcaster Mage.
5. Resolve the Dualcaster Mage trigger, copying Entering, with the copy targeting Dualcaster Mage
6. Resolve the Entering copy, returning Dualcaster Mage from your graveyard to the battlefield.
7. Repeat from step 3.