Oathsworn Vampire, Phyrexian Altar, and Birgi, God of Storytelling // Harnfel, Horn of Bounty

Prerequisites

• Oathsworn Vampire on the battlefield
• Phyrexian Altar on the battlefield
• Birgi, God of Storytelling // Harnfel, Horn of Bounty on the battlefield
• available

Steps

1. Activate Phyrexian Altar by sacrificing Oathsworn Vampire, adding
2. Cast Oathsworn Vampire from your graveyard by paying
3. Birgi triggers, adding
4. Repeat

Results

• Infinite creature LTB
• Infinite creature ETB
• Infinite creature sacrifice triggers
• Infinite death triggers
• Infinite storm count