Totentanz, Swarm Piper, Phyrexian Altar, and Oathsworn Vampire

Prerequisites

• Totentanz, Swarm Piper on the battlefield
• Phyrexian Altar on the battlefield
• Oathsworn Vampire on the battlefield
• You have gained life this turn

Steps

1. Activate Phyrexian Altar by sacrificing Oathsworn Vampire, adding
2. When Oathsworn Vampire dies, Totentanz triggers, creating a 1/1 Rat creature token
3. Activate Phyrexian Altar by sacrificing the Rat, adding
4. Cast Oathsworn Vampire from your graveyard by paying
5. Repeat

Results

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