Inalla, Archmage Ritualist + Riptide Laboratory + Timestream Navigator

Mana needed: {5}{U}{U}{U}{U} each turn

UBR identity

Commander legal

The 3 combo pieces

• Inalla, Archmage Ritualist
• Riptide Laboratory
• Timestream Navigator

What must be in place

You control at least nine permanents or have the city's blessing.

How to execute it

1. Cast Timestream Navigator by paying {1}{U}.
2. Timestream Navigator enters the battlefield, triggering Inalla, causing you to pay {1} to create a token copy of Timestream Navigator with haste.
3. If you do not have the city's blessing, Timestream Navigator triggers, giving you the city's blessing for the rest of the game.
4. Activate Riptide Laboratory by paying {1}{U} and tapping it, returning the nontoken Timestream Navigator to your hand from the battlefield.
5. Activate the token 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.
6. Repeat each turn.

What the combo produces

• Infinite turns
• Lock