Nim Deathmantle, Phyrexian Altar, and Somberwald Beastmaster

Prerequisites

• Nim Deathmantle on the battlefield
• Phyrexian Altar on the battlefield
• Somberwald Beastmaster on the battlefield
• available

Steps

1. Activate Phyrexian 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 Phyrexian Altar three times by sacrificing the Wolf and two Beasts, adding
5. Repeat

Results

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