Rendmaw, Creaking Nest, Nim Deathmantle, and Ashnod's Altar

Prerequisites

• Rendmaw, Creaking Nest on the battlefield
• Nim Deathmantle on the battlefield
• Ashnod's Altar on the battlefield
• available

Steps

1. Activate Ashnod's Altar by sacrificing Rendmaw, adding
2. When Rendmaw dies, Nim Deathmantle triggers, causing you to pay to return Rendmaw from your graveyard to the battlefield, and attach Nim Deathmantle to it
3. When Rendmaw enters the battlefield, it triggers, causing each player to create a tapped 2/2 Bird creature token
4. Activate Ashnod's Altar by sacrificing the Bird, adding
5. Repeat

Results

• Infinite LTB
• Infinite ETB
• Infinite sacrifice triggers
• Infinite death triggers
• Infinite ETB for opponents
• Infinite tapped creature tokens for opponents