Nether Traitor, Altar of Dementia, Sek'Kuar, Deathkeeper, and Elven Chorus

Prerequisites

• Nether Traitor on the battlefield
• Altar of Dementia on the battlefield
• Sek'Kuar, Deathkeeper on the battlefield
• Elven Chorus on the battlefield

Steps

1. Activate Altar of Dementia by sacrificing Nether Traitor Sek'Kuar triggers, creating a 3/1 Graveborn creature token creature with haste
2. Resolve the Altar of Dementia ability, milling the targeted player a number of cards equal to the sacrificed creature's power
3. Activate the Graveborn token using the ability granted by Elven Chorus by tapping it, adding
4. Activate Altar of Dementia by sacrificing the Graveborn token Nether Traitor triggers, causing you to pay to return it from your graveyard to the battlefield
5. Resolve the Altar of Dementia ability, milling the targeted player a number of cards equal to the sacrificed creature's power
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 mill
• Infinite self-mill