Oathsworn Vampire, Phyrexian Altar, and Rowan, Scion of War

Prerequisites

• Oathsworn Vampire on the battlefield
• Phyrexian Altar on the battlefield
• Rowan, Scion of War on the battlefield

Steps

1. Activate Rowan by tapping it
2. Activate Phyrexian Altar by sacrificing Oathsworn Vampire, adding
3. Cast Oathsworn Vampire from your graveyard by paying
4. Repeat from step 2

Results

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