Saffi Eriksdotter, Fiendish Panda, and Yahenni, Undying Partisan

Prerequisites

• Saffi Eriksdotter on the battlefield
• Fiendish Panda on the battlefield
• Yahenni, Undying Partisan on the battlefield

Steps

1. Activate Saffi by sacrificing it, targeting Fiendish Panda
2. Activate Yahenni by sacrificing Fiendish Panda
3. When Fiendish Panda dies, its second ability and Saffi trigger
4. Resolve the Saffi trigger, returning Fiendish Panda from your graveyard to the battlefield
5. Resolve the Fiendish Panda trigger, returning Saffi from your graveyard to the battlefield
6. Resolve the Yahenni ability
7. Repeat

Results

• Infinite LTB
• Infinite ETB
• Infinite sacrifice triggers
• Infinite death triggers