Grolnok, the Omnivore, Timestream Navigator, and Cellar Door

Prerequisites

• Grolnok, the Omnivore on the battlefield
• Timestream Navigator on the battlefield
• Cellar Door on the battlefield
• Timesteam Navigator does not have summoning sickness
• You have the city's blessing
• each turn available

Steps

1. Activate Timestream Navigator by paying , tapping it and putting it on the bottom of your library, causing you to take an extra turn after this one
2. Activate Cellar Door by paying and tapping it, causing you to put Timestream Navigator from the bottom of your library into your graveyard and create a 2/2 Zombie creature token
3. Grolnok triggers, exiling Timestream Navigator with a croak counter on it
4. Cast Timestream Navigator from exile by paying
5. Repeat each turn

Results

• Infinite turns