Nim Deathmantle, Ashnod's Altar, and Crawling Chorus

Prerequisites

• Nim Deathmantle on the battlefield
• Ashnod's Altar on the battlefield
• Crawling Chorus on the battlefield

Steps

1. Activate Ashnod's Altar by sacrificing Crawling Chorus, adding
2. When Crawling Chorus dies, it and Nim Deathmantle trigger, Resolve the Crawling Chorus trigger, creating a creature token
3. Holding priority, activate Ashnod's Altar by sacrificing a creature token, adding
4. Resolve the Nim Deathmantle trigger, causing you to pay to return Crawling Chorus from your graveyard to the battlefield and attach Nim Deathmantle to it
5. Repeat

Results

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