Nim Deathmantle, Phyrexian Altar, and Chittering Witch

Prerequisites

• Nim Deathmantle on the battlefield
• Phyrexian Altar on the battlefield
• Chittering Witch on the battlefield
• You have at least three opponents
• available

Steps

1. Activate Phyrexian 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 three 1/1 Rat creature tokens
4. Activate Phyrexian Altar three times by sacrificing three Rats, adding
5. Repeat

Results

• Infinite death triggers
• Infinite ETB
• Infinite LTB
• Infinite sacrifice triggers