Nim Deathmantle, Ashnod's Altar, and Chittering Witch

Prerequisites

• Nim Deathmantle on the battlefield
• Ashnod's Altar on the battlefield
• Chittering Witch on the battlefield
• available

Steps

1. Activate Ashnod's Altar by sacrificing Chittering Witch, adding
2. When Chittering Witch dies, Nim Deathmantle triggers, causing you to pay to return Chittering Witch from your graveyard to the battlefield and attach Nim Deathmantle to it
3. When Chittering Witch enters, it triggers, creating at least one creature token
4. Activate Ashnod's Altar by sacrificing a creature token, adding
5. Repeat

Results

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