Nether Traitor, Phyrexian Altar, and Pawn of Ulamog

Prerequisites

• Nether Traitor on the battlefield
• Phyrexian Altar on the battlefield
• Pawn of Ulamog on the battlefield

Steps

1. Activate Phyrexian Altar by sacrificing Nether Traitor, adding
2. When Nether Traitor dies, Pawn of Ulamog triggers, creating a creature token
3. Activate Phyrexian Altar by sacrificing the creature token, adding one mana of any color
4. When the creature token dies, Nether Traitor triggers, causing you to pay to return Nether Traitor from your graveyard to the battlefield
5. Repeat

Results

• Infinite colored mana
• Infinite death triggers
• Infinite ETB
• Infinite LTB
• Infinite sacrifice triggers
• Infinite colorless mana