Regal Caracal, Nim Deathmantle, and Ashnod's Altar

Prerequisites

• Regal Caracal on the battlefield
• Nim Deathmantle on the battlefield
• Ashnod's Altar on the battlefield
• available

Steps

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

Results

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