Nim Deathmantle, Ashnod's Altar, and Precursor Golem

Prerequisites

• Nim Deathmantle on the battlefield
• Ashnod's Altar on the battlefield
• Precursor Golem on the battlefield
• available

Steps

1. Activate Ashnod's Altar by sacrificing Precursor Golem, adding
2. When Precursor Golem dies, Nim Deathmantle triggers, causing you to pay to return Precursor Golem from your graveyard to the battlefield, and attach Nim Deathmantle to it
3. When Precursor Golem enters the battlefield, its first ability triggers, creating two 3/3 Golem creature tokens
4. Activate Ashnod's Altar by sacrificing a Golem, adding
5. Repeat

Results

• Infinite colorless mana
• Infinite creature tokens
• Infinite death triggers
• Infinite ETB
• Infinite LTB
• Infinite sacrifice triggers