Nim Deathmantle, Ashnod's Altar, and The Swarmweaver

Prerequisites

• Nim Deathmantle on the battlefield
• Ashnod's Altar on the battlefield
• The Swarmweaver on the battlefield
• available

Steps

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