Nim Deathmantle, Ashnod's Altar, and Su-Chi Cave Guard

Prerequisites

• Nim Deathmantle on the battlefield
• Ashnod's Altar on the battlefield
• Su-Chi Cave Guard on the battlefield

Steps

1. Activate Ashnod's Altar by sacrificing Su-Chi Cave Guard, adding
2. When Su-Chi Cave Guard dies, it and Nim Deathmantle triggers
3. Resolve the Su-Chi Cave Guard trigger, adding eight
4. Resolve the Nim Deathmantle trigger from step 2, causing you to pay to return Su-Chi Cave Guard from your graveyard to the battlefield, and attach Nim Deathmantle to it
5. Repeat

Results

• Infinite colorless mana
• Infinite death triggers
• Infinite ETB
• Infinite LTB
• Infinite sacrifice triggers