Nim Deathmantle, Ashnod's Altar, and Birthing Hulk

Prerequisites

• Nim Deathmantle on the battlefield
• Ashnod's Altar on the battlefield
• Birthing Hulk on the battlefield
• available

Steps

1. Activate Ashnod's Altar by sacrificing Birthing Hulk, adding
2. When Birthing Hulk dies, Nim Deathmantle triggers, causing you to pay to return Birthing Hulk from your graveyard to the battlefield and attach Nim Deathmantle to it
3. When Birthing Hulk 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