Nim Deathmantle, Ashnod's Altar, Xorn, and Galazeth Prismari

Prerequisites

• Nim Deathmantle on the battlefield
• Ashnod's Altar on the battlefield
• Xorn on the battlefield
• Galazeth Prismari on the battlefield
• available

Steps

1. Activate Ashnod's Altar by sacrificing Galazeth Prismari, adding
2. Galazeth Prismari dies, triggering Nim Deathmantle, causing you to pay to return Galazeth Prismari from your graveyard to the battlefield, and attach Nim Deathmantle to it
3. Galazeth Prismari enters the battlefield, creating two Treasure tokens
4. Activate two Treasure tokens by tapping and sacrificing those, adding two mana of any color
5. Repeat

Results

• Infinite death triggers
• Infinite ETB
• Infinite LTB
• Infinite sacrifice triggers