Ashnod's Altar + Dualcaster Mage + Lively Dirge

Ashnod's Altar

Dualcaster Mage

Lively Dirge

How it works

1. Cast Lively Dirge by paying 1 plus an additional 2 to select its second mode, targeting a card in your graveyard.
2. Holding priority, cast Dualcaster Mage by paying its mana cost.
3. When Dualcaster Mage enters, it triggers, targeting Lively Dirge.
4. Holding priority, activate Ashnod's Altar by sacrificing Dualcaster Mage.
5. Resolve the Dualcaster Mage trigger, copying Lively Dirge
6. Resolve the Lively Dirge copy, returning Dualcaster Mage from your graveyard to the battlefield.
7. Repeat from step 3.