Bontu's Monument, Oathsworn Vampire, and Phyrexian Altar

Prerequisites

• Bontu's Monument on the battlefield
• Oathsworn Vampire in hand
• Phyrexian Altar on the battlefield
• available

Steps

1. Cast Oathsworn Vampire by paying
2. Bontu's Monument triggers, causing you to gain 1 life and each opponent to lose 1 life
3. Activate Phyrexian Altar by sacrificing Oathswon Vampire, adding
4. Cast Oathsworn Vampire from your graveyard by paying
5. Repeat from step 2

Results

• Infinite death triggers
• Infinite ETB
• Infinite lifegain
• Infinite lifegain triggers
• Infinite lifeloss
• Infinite LTB
• Infinite storm count