Fiend Artisan + Gravecrawler + Timestream Navigator

Mana needed: {4}{U}{U}{B}{B/G} each turn

BGU identity

Commander legal

The 3 combo pieces

• Fiend Artisan
• Gravecrawler
• Timestream Navigator

What must be in place

You have the city's blessing.
Timestream Navigator and Fiend Artisan do not have summoning sickness.
You control at least one additional Zombie.

How to execute it

1. Activate Timestream Navigator by paying {2}{U}{U}, tapping it and putting it on the bottom of your library from the battlefield, causing you to take an extra turn after this one.
2. Activate Fiend Artisan by paying {2}{B/G} and sacrificing Gravecrawler, causing you to search your library for Timestream Navigator and put it onto the battlefield.
3. Cast Gravecrawler from your graveyard by paying {B}.
4. Repeat each turn.

What the combo produces

• Infinite turns
• Lock