Nim Deathmantle, Ashnod's Altar, and Ancient Stone Idol

Prerequisites

• Nim Deathmantle on the battlefield
• Ashnod's Altar on the battlefield
• Ancient Stone Idol on the battlefield

Steps

1. Activate Ashnod's Altar by sacrificing Ancient Stone Idol, adding
2. When Ancient Stone Idol dies, it and Nim Deathmantle trigger, Resolve the Ancient Stone Idol 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 Ancient Stone Idol 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