Cellar Door + Grolnok, the Omnivore + Timestream Navigator

Mana needed: {6}{U}{U}{U} each turn

GU identity

Commander legal

The 3 combo pieces

• Cellar Door
• Grolnok, the Omnivore
• Timestream Navigator

What must be in place

Timesteam Navigator does not have summoning sickness.
You have the city's blessing.

How to execute it

1. Activate Timestream Navigator by paying {2}{U}{U}, 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 {3} 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 {1}{U}.
5. Repeat each turn.

What the combo produces

• Infinite turns
• Lock