Ashnod's Altar + Dualcaster Mage + Supernatural Stamina

Ashnod's Altar

Dualcaster Mage

Supernatural Stamina

How it works

1. Cast Supernatural Stamina by paying its mana cost.
2. Holding priority, cast Dualcaster Mage by paying its mana cost.
3. When Dualcaster Mage enters, it triggers, copying Supernatural Stamina, with the copy targeting Dualcaster Mage.
4. Resolve the copy of Supernatural Stamina.
5. Holding priority, activate Ashnod's Altar by sacrificing Dualcaster Mage.
6. When Dualcaster Mage dies, it triggers, returning it from your graveyard to the battlefield.
7. Repeat from step 3.