Saffi Eriksdotter, Jackdaw Savior, and Bloodthrone Vampire

Prerequisites

• Saffi Eriksdotter on the battlefield
• Jackdaw Savior on the battlefield
• Bloodthrone Vampire on the battlefield

Steps

1. Activate Saffi by sacrificing it, targeting Jackdaw Savior
2. Activate Bloodthrone Vampire by sacrificing Jackdaw Savior
3. When Jackdaw Savior dies, it and Saffi trigger
4. Resolve the Jackdaw Savior trigger, returning Saffi from your graveyard to the battlefield
5. Resolve the Saffi trigger, returning Jackdaw Savior from your graveyard to the battlefield
6. Resolve the Bloodthrone Vampire ability
7. Repeat

Results

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