Saffi Eriksdotter, Fiendish Panda, and Ashnod's Altar

Prerequisites

• Saffi Eriksdotter on the battlefield
• Fiendish Panda on the battlefield
• Ashnod's Altar on the battlefield

Steps

1. Activate Saffi by sacrificing it, targeting Fiendish Panda
2. Activate Ashnod's Altar by sacrificing Fiendish Panda, adding
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. Repeat

Results

• Infinite creature LTB
• Infinite creature ETB
• Infinite creature sacrifice triggers
• Infinite death triggers
• Infinite colorless mana