Nim Deathmantle, Ashnod's Altar, and Breya's Apprentice

Prerequisites

• Nim Deathmantle on the battlefield
• Ashnod's Altar on the battlefield
• Breya's Apprentice on the battlefield
• available

Steps

1. Activate Ashnod's Altar by sacrificing Breya's Apprentice, adding
2. Breya's Apprentice dies, triggering Nim Deathmantle, causing you to pay to return Breya's Apprentice from your graveyard to the battlefield, and attach Nim Deathmantle to it
3. Breya's Apprentice enters the battlefield, creating a 1/1 Thopter artifact creature token
4. Activate Ashnod's Altar by sacrificing the Thopter, adding
5. Repeat

Results

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