Phantom Train, Dualcaster Mage, and Ascend from Avernus

Prerequisites

• Phantom Train on the battlefield
• Dualcaster Mage in hand
• Ascend from Avernus in hand
• available

Steps

1. Cast Ascend from Avernus by paying Holding priority, cast Dualcaster Mage by paying its mana cost
2. When Dualcaster Mage enters, it triggers, targeting Ascend from Avernus
3. Holding priority, activate Phantom Train by sacrificing Dualcaster Mage
4. Resolve the Dualcaster Mage trigger, copying Ascend from Avernus Resolve the Ascend from Avernus copy, returning Dualcaster Mage from your graveyard to the battlefield
5. Repeat from step 3

Results

• Infinite LTB
• Infinite ETB
• Infinite sacrifice triggers
• Infinite death triggers
• Infinite magecraft triggers
• Infinite recursion of creature cards in your graveyard
• Infinite +1/+1 counters on a creature