Nim Deathmantle, Ashnod's Altar, and Myr Battlesphere

Prerequisites

• Nim Deathmantle on the battlefield
• Ashnod's Altar on the battlefield
• Myr Battlesphere on the battlefield
• available

Steps

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

Results

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