Nim Deathmantle, Ashnod's Altar, and Somberwald Beastmaster

Prerequisites

• Nim Deathmantle on the battlefield
• Ashnod's Altar on the battlefield
• Somberwald Beastmaster on the battlefield
• available

Steps

1. Activate Ashnod's Altar by sacrificing Somberwald Beastmaster, adding
2. Somberwald Beastmaster dies, triggering Nim Deathmantle, causing you to pay to return Somberwald Beastmaster from your graveyard to the battlefield, and attach Nim Deathmantle to it
3. Somberwald Beastmaster enters the battlefield, creating a 2/2 Wolf, a 3/3 Beast and a 4/4 Beast creature token
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