Nim Deathmantle, Ashnod's Altar, and Ferocious Pup

Prerequisites

• Nim Deathmantle on the battlefield
• Ashnod's Altar on the battlefield
• Ferocious Pup on the battlefield
• available

Steps

1. Activate Ashnod's Altar by sacrificing Ferocious Pup, adding
2. When Ferocious Pup dies, Nim Deathmantle triggers, causing you to pay to return Ferocious Pup from your graveyard to the battlefield, and attach Nim Deathmantle to it
3. When Ferocious Pup enters the battlefield, it triggers, creating a 2/2 Wolf creature token
4. Activate Ashnod's Altar by sacrificing the Wolf, adding
5. Repeat

Results

• Infinite death triggers
• Infinite ETB
• Infinite LTB
• Infinite sacrifice triggers