Priest of Urabrask, Nim Deathmantle, and Ashnod's Altar

Prerequisites

• Priest of Urabrask on the battlefield
• Nim Deathmantle on the battlefield
• Ashnod's Altar on the battlefield
• available

Steps

1. Activate Ashnod's Altar by sacrificing Priest of Urabrask, adding
2. Nim Deathmantle triggers, causing you to pay to return Priest of Urabrask from your graveyard to the battlefield, and attach Nim Deathmantle to it
3. Priest of Urabrask enters the battlefield, adding
4. Repeat

Results

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