How can you create a combo with Timestream Navigator, Molten Echoes, Riptide Laboratory?
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[START OF COMBO]This combo can be formed with Timestream Navigator, Molten Echoes, Riptide Laboratory

Color identity: UR
Mana cost: {3}{U}{U}{U} each turn
Steps:
  1. Cast Timestream Navigator by paying {1}{U}.
  2. If you don't have the city's blessing and control ten or more permanents, Timestream Navigator gives you the city's blessing.
  3. When Timestream Navigator enters the battlefield, Molten Echoes triggers, creating a token copy of Timestream Navigator with haste.
  4. If you don't have the city's blessing, the Timestream Navigator token gives you the city's blessing.
  5. Activate Riptide Laboratory's second ability by paying {1}{U} and tapping it, returning the nontoken Timestream Navigator to your hand from the battlefield.
  6. Activate the Timestream Navigator token 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.
  7. Repeat each turn.[END OF COMBO STEPS]

Result:
  - Infinite turns[END OF COMBO RESULT][END OF COMBO]

Other prerequisites:
  - Timestream Navigator must be in your hand
  - Molten Echoes must be on the battlefield
  - Riptide Laboratory must be on the battlefield
  - You have the city's blessing and/or control at least eight permanents.
  - "Human", "Pirate", or "Wizard" chosen with Molten Echoes.
[END OF COMBO PREREQUISITES]
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