Nim Deathmantle, Ashnod's Altar, and Blessed Sanctuary

Prerequisites

• Nim Deathmantle on the battlefield
• Ashnod's Altar on the battlefield
• Blessed Sanctuary on the battlefield
• You control at least one nontoken creature
• available

Steps

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

Results

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