Nim Deathmantle, Ashnod's Altar, and Neriv, Crackling Vanguard

Prerequisites

• Nim Deathmantle on the battlefield
• Ashnod's Altar on the battlefield
• Neriv, Crackling Vanguard on the battlefield
• available

Steps

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

Results

• Infinite ETB
• Infinite LTB
• Infinite colorless mana
• Infinite creature tokens
• Infinite death triggers
• Infinite sacrifice triggers