Nim Deathmantle, Phyrexian Altar, and Brood Monitor

Prerequisites

• Nim Deathmantle on the battlefield
• Phyrexian Altar on the battlefield
• Brood Monitor on the battlefield
• available

Steps

1. Activate Phyrexian Altar by sacrificing Brood Monitor, adding
2. Brood Monitor dies, triggering Nim Deathmantle, causing you to pay to return Brood Monitor from your graveyard to the battlefield, and attach Nim Deathmantle to it
3. Brood Monitor enters the battlefield, creating three 1/1 Eldrazi Scion creature tokens
4. Activate Phyrexian Altar three times by sacrificing three Eldrazi Scions, adding
5. Repeat

Results

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