Nim Deathmantle, Ashnod's Altar, and Black Panther, Vanguard

Prerequisites

• Nim Deathmantle on the battlefield
• Ashnod's Altar on the battlefield
• Black Panther, Vanguard on the battlefield
• available

Steps

1. Activate Ashnod's Altar by sacrificing the other Hero, adding
2. When the Hero dies, Nim Deathmantle triggers, causing you to pay to return the Hero from your graveyard to the battlefield and attach Nim Deathmantle to it
3. When the Hero enters, Black Panther triggers, creating a creature token
4. Activate Ashnod's Altar by sacrificing a creature token, adding
5. Repeat

Results

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