Morophon, the Boundless, Saffi Eriksdotter, Eternal Witness, and Carrion Feeder

Prerequisites

• Morophon, the Boundless on the battlefield
• Saffi Eriksdotter on the battlefield
• Eternal Witness on the battlefield
• Carrion Feeder on the battlefield
• "Human" or "Scout" chosen with Morophon

Steps

1. Activate Saffi by sacrificing it, targeting Eternal Witness
2. Activate Carrion Feeder by sacrificing Eternal Witness
3. When Eternal Witness dies, Saffi triggers, returning Eternal Witness from your graveyard to the battlefield
4. When Eternal Witness enters the battlefield, it triggers, returning Saffi from your graveyard to your hand
5. Resolve the Carrion Feeder ability, putting a +1/+1 counter on it
6. Cast Saffi by paying due to Morophon
7. Repeat

Results

• Infinite +1/+1 counters on Carrion Feeder
• Infinite death triggers
• Infinite ETB
• Infinite LTB
• Infinite sacrifice triggers
• Infinite storm count