Nim Deathmantle, Ashnod's Altar, and Brood Monitor

Prerequisites

• Nim Deathmantle on the battlefield
• Ashnod's Altar on the battlefield
• Brood Monitor on the battlefield
• available

Steps

1. Activate Ashnod's Altar by sacrificing Brood Monitor, adding
2. Brood Monitor dies, triggering Nim Deathmantle, causing you to pay to return Brood Monitor from your graveyard to the battlefield, and attach Nim Deathmantle to it
3. Brood Monitor enters the battlefield, creating three 1/1 Eldrazi Scion creature tokens
4. Activate Ashnod's Altar by sacrificing an Eldrazi Scion, adding
5. Repeat

Results

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