Totentanz, Swarm Piper, Nim Deathmantle, and Ashnod's Altar

Prerequisites

• Totentanz, Swarm Piper on the battlefield
• Nim Deathmantle on the battlefield
• Ashnod's Altar on the battlefield

Steps

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

Results

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