Nim Deathmantle, Ashnod's Altar, and Liberated Livestock

Prerequisites

• Nim Deathmantle on the battlefield
• Ashnod's Altar on the battlefield
• Liberated Livestock on the battlefield

Steps

1. Activate Ashnod's Altar by sacrificing Liberated Livestock, adding
2. When Liberated Livestock dies, it and Nim Deathmantle triggers
3. Resolve the Liberated Livestock trigger, creating a 1/1 Cat, a 1/1 Bird, and a 2/4 Ox creature token
4. Activate Ashnod's Altar by sacrificing a creature token, adding
5. Resolve the Nim Deathmantle trigger from step 2, causing you to pay to return Liberated Livestock from your graveyard to the battlefield, and attach Nim Deathmantle to it
6. Repeat

Results

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