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

Color identity: UBR
Mana cost: {5}{U}{U}{U}{U} each turn
Steps:
  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.[END OF COMBO STEPS]

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

Other prerequisites:
  - Timestream Navigator must be in your hand
  - Riptide Laboratory must be on the battlefield
  - Inalla, Archmage Ritualist must be on the battlefield or in the command zone
  - You control at least nine permanents or have the city's blessing.
[END OF COMBO PREREQUISITES]
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