Ashnod's Altar, Dualcaster Mage, and Fearsome Awakening

Prerequisites

• Ashnod's Altar on the battlefield
• Dualcaster Mage in hand
• Fearsome Awakening in hand
• available

Steps

1. Cast Fearsome Awakening by paying its mana cost
2. Holding priority, cast Dualcaster Mage by paying its mana cost
3. When Dualcaster Mage enters, it triggers, targeting Fearsome Awakening
4. Holding priority, activate Ashnod's Altar by sacrificing Dualcaster Mage, adding
5. Resolve the Dualcaster Mage trigger, copying Fearsome Awakening Resolve the Fearsome Awakening 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