Nim Deathmantle, Ashnod's Altar, and Rekindling Phoenix

Prerequisites

• Nim Deathmantle on the battlefield
• Ashnod's Altar on the battlefield
• Rekindling Phoenix on the battlefield

Steps

1. Activate Ashnod's Altar by sacrificing Rekindling Phoenix, adding
2. When Rekindling Phoenix dies, it and Nim Deathmantle triggers
3. Resolve the Rekindling Phoenix trigger, creating a 0/1 Elemental creature token
4. Activate Ashnod's Altar by sacrificing the Elemental, adding
5. Resolve the Nim Deathmantle trigger from step 2, causing you to pay to return Rekindling Phoenix 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