Umbral Collar Zealot, Dualcaster Mage, and Corpse Dance

Prerequisites

• Umbral Collar Zealot on the battlefield
• Dualcaster Mage in hand
• Corpse Dance in hand
• available

Steps

1. Cast Corpse Dance by paying its mana cost, targeting any applicable target
2. Holding priority, cast Dualcaster Mage by paying its mana cost
3. When Dualcaster Mage enters, it triggers, targeting Corpse Dance
4. Holding priority, activate Umbral Collar Zealot by sacrificing Dualcaster Mage
5. Resolve the Dualcaster Mage trigger, copying Corpse Dance, with the copy targeting Dualcaster Mage Resolve the Corpse Dance copy, returning Dualcaster Mage from your graveyard to the battlefield
6. Repeat from step 3

Results

• Infinite LTB
• Infinite ETB
• Infinite sacrifice triggers
• Infinite death triggers
• Infinite magecraft triggers
• Infinite surveil 1