Timestream Navigator + Riptide Laboratory + Archmage of Echoes
Produces: Infinite turns, Lock



- Color identity
- U
- Mana
- {1}{U} available the first turn, with {4}{U}{U}{U}{U} each following turn
Prerequisites
You have the city's blessing, and/or control (at least) eight permanents
Steps
- Cast Timestream Navigator by paying {1}{U}.
- Archmage of Echoes triggers, copying the Timestream Navigator spell.
- Resolve both Timestream Navigator spells.
- If you don't have the city's blessing, either the Timestream Navigator token or the nontoken Timestream Navigator gives you the city's blessing.
- During your next turn, activate Riptide Laboratory's second ability by paying {1}{U} and tapping it, returning the nontoken Timestream Navigator to your hand from the battlefield.
- Activate the ability of the Timestream Navigator token by paying {2}{U}{U}, tapping it and putting on the bottom of your library, causing you to take an extra turn after that one.
- Repeat.