Workshop Warchief, Nim Deathmantle, and Ashnod's Altar

Prerequisites

• Workshop Warchief on the battlefield
• Nim Deathmantle on the battlefield
• Ashnod's Altar on the battlefield

Steps

1. Activate Ashnod's Altar by sacrificing Workshop Warchief, adding
2. Workshop Warchief dies, triggering itself and Nim Deathmantle
3. Resolve the Workshop Warchief trigger, creating a 4/4 Beast creature token
4. Activate Ashnod's Altar by sacrificing the Beast, adding
5. Resolve the Nim Deathmantle trigger from step 2, causing you to pay to return Workshop Warchief from your graveyard to the battlefield, and attach Nim Deathmantle to it
6. Workshop Warchief enters the battlefield, causing you to gain three life
7. Repeat

Results

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