Umbral Collar Zealot, Dualcaster Mage, and Bond of Revival

Prerequisites

• Umbral Collar Zealot on the battlefield
• Dualcaster Mage in hand
• Bond of Revival in hand
• available

Steps

1. Cast Bond of Revival by paying its mana cost
2. Holding priority, cast Dualcaster Mage by paying its mana cost
3. When Dualcaster Mage enters, it triggers, targeting Bond of Revival
4. Holding priority, activate Umbral Collar Zealot by sacrificing Dualcaster Mage, causing you to surveil 1
5. Resolve the Dualcaster Mage trigger, copying Bond of Revival Resolve the Bond of Revival copy, returning Dualcaster Mage from your graveyard to the battlefield
6. Repeat from step 3

Results

• Infinite creature ETB
• Infinite creature LTB
• Infinite creature sacrifice triggers
• Infinite death triggers
• Infinite magecraft triggers
• Infinite surveil