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. Ancient Stone Idol dies, triggering itself and Nim Deathmantle
3. Resolve the Ancient Stone Idol trigger, creating a 6/12 Construct artifact creature token
4. Activate Ashnod's Altar by sacrificing the Construct, adding
5. Resolve the Nim Deathmantle trigger from step 2, causing you to pay to return Ancient Stone Idol 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