Nether Traitor, Phyrexian Altar, and Ogre Slumlord

Prerequisites

• Nether Traitor on the battlefield
• Phyrexian Altar on the battlefield
• Ogre Slumlord on the battlefield

Steps

1. Activate Phyrexian Altar by sacrificing Nether Traitor, adding
2. When Nether Traitor dies, Ogre Slumlord 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 LTB
• Infinite ETB
• Infinite colored mana
• Infinite sacrifice triggers
• Infinite death triggers