Dualcaster Mage, Victimize, and Phantom Train

Prerequisites

• Dualcaster Mage in hand
• Victimize in hand
• Phantom Train on the battlefield
• available

Steps

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

Results

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