Saffi Eriksdotter, Sister Hospitaller, and Bloodthrone Vampire

Prerequisites

• Saffi Eriksdotter on the battlefield
• Sister Hospitaller on the battlefield
• Bloodthrone Vampire on the battlefield

Steps

1. Activate Saffi by sacrificing it, targeting Sister Hospitaller Activate Bloodthrone Vampire by sacrificing Sister Hospitaller When Sister Hospitaller dies, Saffi triggers, returning Sister Hospitaller from your graveyard to the battlefield
2. When Sister Hospitaller enters, it triggers, returning Saffi from your graveyard to the battlefield
3. Resolve the Bloodthrone Vampire ability
4. Repeat

Results

• Infinite creature ETB
• Infinite creature LTB
• Infinite death triggers
• Infinite lifegain
• Infinite lifegain triggers
• Infinitely large creature until end of turn