Nim Deathmantle, Ashnod's Altar, and Bridge from Below

Prerequisites

• Nim Deathmantle on the battlefield
• Ashnod's Altar on the battlefield
• Bridge from Below in the graveyard
• You control at least one nontoken creature

Steps

1. Activate Ashnod's Altar by sacrificing a nontoken creature, adding
2. When the creature dies, Bridge from Below and Nim Deathmantle triggers
3. Resolve the Bridge from Below trigger, creating a 2/2 Zombie creature token
4. Activate Ashnod's Altar by sacrificing the Zombie, adding
5. Resolve the Nim Deathmantle trigger from step 2, causing you to pay to return the nontoken creature 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