Nim Deathmantle, Ashnod's Altar, and Baxter Stockman

Prerequisites

• Nim Deathmantle on the battlefield
• Ashnod's Altar on the battlefield
• Baxter Stockman on the battlefield
• available

Steps

1. Activate Ashnod's Altar by sacrificing Baxter Stockman, adding
2. When Baxter Stockman dies, Nim Deathmantle triggers, causing you to pay to return Baxter Stockman from your graveyard to the battlefield and attach Nim Deathmantle to it
3. When Baxter Stockman 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