Nether Traitor, Umbral Collar Zealot, Sek'Kuar, Deathkeeper, and Elven Chorus

Prerequisites

• Nether Traitor on the battlefield
• Umbral Collar Zealot on the battlefield
• Sek'Kuar, Deathkeeper on the battlefield
• Elven Chorus on the battlefield

Steps

1. Activate Umbral Collar Zealot by sacrificing Nether Traitor Sek'Kuar triggers, creating a 3/1 Graveborn creature token creature with haste
2. Resolve the Umbral Collar Zealot ability, surveiling 1
3. Activate the Graveborn token using the ability granted by Elven Chorus by tapping it, adding
4. Activate Umbral Collar Zealot by sacrificing the Graveborn token Nether Traitor triggers, causing you to pay to return it from your graveyard to the battlefield
5. Resolve the Umbral Collar Zealot ability, surveiling 1
6. Activate Nether Traitor using the ability granted by Elven Chorus by tapping it, adding
7. Repeat

Results

• Infinite colored mana
• Infinite creature ETB
• Infinite creature LTB
• Infinite creature sacrifice triggers
• Infinite death triggers
• Infinite surveil