Ashnod's Altar, Nim Deathmantle, Teysa Karlov, and Myr Moonvessel

Prerequisites

• Ashnod's Altar on the battlefield
• Nim Deathmantle on the battlefield
• Teysa Karlov on the battlefield
• Myr Moonvessel on the battlefield

Steps

1. Activate Ashnod's Altar by sacrificing Myr Moonvessel, adding
2. When Myr Moonvessel dies, it and Nim Deathmantle triggers twice
3. Resolve both Myr Moonvessel triggers, adding
4. Resolve the first Nim Deathmantle trigger, choosing not to pay
5. Resolve the second Nim Deathmantle trigger, causing you to pay to return Myr Moonvessel 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