Nim Deathmantle, Ashnod's Altar, and The Unbeatable Squirrel Girl

Prerequisites

• Nim Deathmantle on the battlefield
• Ashnod's Altar on the battlefield
• The Unbeatable Squirrel Girl on the battlefield
• available

Steps

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