Nim Deathmantle, Ashnod's Altar, and Siege Veteran

Prerequisites

• Nim Deathmantle on the battlefield
• Ashnod's Altar on the battlefield
• Siege Veteran on the battlefield
• You control at least one additional nontoken Soldier

Steps

1. Activate Ashnod's Altar by sacrificing another nontoken Soldier, adding
2. The Soldier dies, triggering Seige Veteran and Nim Deathmantle
3. Resolve the Siege Veteran trigger, creating a 1/1 Soldier artifact creature token
4. Activate Ashnod's Altar by sacrificing the Soldier, adding
5. Resolve the Nim Deathmantle trigger from step 2, causing you to pay to return the nontoken Soldier 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