Phantom Train, Supernatural Stamina, and Dualcaster Mage

Prerequisites

• Phantom Train on the battlefield
• Supernatural Stamina in hand
• Dualcaster Mage in hand
• available

Steps

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 Phantom Train by sacrificing Dualcaster Mage
6. When Dualcaster Mage dies, it triggers, returning it from your graveyard to the battlefield
7. Repeat from step 3
8. Resolve all Phantom Train abilities from step 5

Results

• Infinite LTB
• Infinite ETB
• Infinite sacrifice triggers
• Infinite death triggers
• Infinite magecraft triggers
• Infinite +1/+1 counters on a creature