Morophon, the Boundless, Honest Rutstein, and Progenitor Mimic

Prerequisites

• Morophon, the Boundless on the battlefield
• Honest Rutstein on the battlefield
• Progenitor Mimic on the battlefield
• available

Steps

1. Cast Progenitor Mimic by paying its mana cost
2. Choose to have it enter as a copy of Honest Rutstein
3. Put Honest Rutstein into your graveyard due to the legend rule
4. Progenitor Mimic triggers, returning Honest Rutstein from your graveyard to your hand
5. Cast Honest Rutstein by paying due to Morophon and Progenitor Mimic
6. Put Honest Rutstein into your graveyard due to the legend rule
7. Honest Rutstein triggers, returning it from your graveyard to your hand
8. Repeat from step 4

Results

• Infinite ETB
• Infinite LTB
• Infinite death triggers
• Infinite storm count