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
• You have at least two opponents
• available

Steps

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

Results

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