Felisa, Fang of Silverquill, Nether Traitor, Phyrexian Altar, and Mikaeus, the Unhallowed

Prerequisites

• Felisa, Fang of Silverquill on the battlefield
• Nether Traitor on the battlefield
• Phyrexian Altar on the battlefield
• Mikaeus, the Unhallowed on the battlefield

Steps

1. Activate Phyrexian Altar by sacrificing Nether Traitor, adding
2. Nether Traitor dies, triggering Mikaeus, returning Nether Traitor from your graveyard to the battlefield with a +1/+1 on it
3. Activate Phyrexian Altar by sacrificing Nether Traitor, adding one mana of any color
4. Nether Traitor dies, triggering Felisa, creating a 2/1 Inkling creature token
5. Activate Phyrexian Altar by sacrificing the Inkling, adding one mana of any color
6. The Inkling dies, triggering Nether Traitor, causing you to pay to return it from your graveyard to the battlefield
7. Repeat

Results

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