Saffi Eriksdotter, Fiendish Panda, and Phyrexian Altar

Prerequisites

• Saffi Eriksdotter on the battlefield
• Fiendish Panda on the battlefield
• Phyrexian Altar on the battlefield

Steps

1. Activate Saffi by sacrificing it, targeting Fiendish Panda
2. Activate Phyrexian Altar by sacrificing Fiendish Panda, adding one mana of any color
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 LTB
• Infinite ETB
• Infinite colored mana
• Infinite sacrifice triggers
• Infinite death triggers