Morophon, the Boundless, Honest Rutstein, and Undercover Operative

Prerequisites

• Morophon, the Boundless on the battlefield
• Honest Rutstein on the battlefield
• Undercover Operative on the battlefield
• available

Steps

1. Cast Undercover Operative 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. Undercover Operative triggers, returning Honest Rutstein from your graveyard to your hand
5. Cast Honest Rutstein by paying due to Morophon and Undercover Operative
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