Nim Deathmantle, Ashnod's Altar, and Moseo, Vein's New Dean

Prerequisites

• Nim Deathmantle on the battlefield
• Ashnod's Altar on the battlefield
• Moseo, Vein's New Dean on the battlefield
• available

Steps

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

Results

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