Ashnod's Altar, Dualcaster Mage, and Rise Again

Prerequisites

• Ashnod's Altar on the battlefield
• Dualcaster Mage in hand
• Rise Again in hand
• available

Steps

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

Results

• Infinite colorless mana
• Infinite creature ETB
• Infinite creature LTB
• Infinite creature sacrifice triggers
• Infinite death triggers
• Infinite magecraft triggers