Timestream Navigator, Riptide Laboratory, and Inalla, Archmage Ritualist

Prerequisites

• Timestream Navigator in hand
• Riptide Laboratory on the battlefield
• Inalla, Archmage Ritualist on the battlefield or in the command zone
• You control at least nine permanents or have the city's blessing
• each turn available

Steps

1. Cast Timestream Navigator by paying
2. Timestream Navigator enters the battlefield, triggering Inalla, causing you to pay 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 and tapping it, returning the nontoken Timestream Navigator to your hand from the battlefield
5. Activate the token 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
6. Repeat each turn

Results

• Infinite turns