How can you create a combo with Timestream Navigator, Leveler?
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[START OF COMBO]This combo can be formed with Timestream Navigator, Leveler

Color identity: U
Mana cost: {5} the first turn, with {3}{U}{U}{U} available each other turn
Steps:
  1. Cast Leveler by paying {5}.
  2. When Leveler enters the battlefield, it triggers, exiling your library.
  3. During your next upkeep step, activate 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.
  4. Move to your draw step, drawing Timestream Navigator from your library.
  5. Cast Timestream Navigator by paying {1}{U}.
  6. Repeat from step 3 each turn.[END OF COMBO STEPS]

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

Other prerequisites:
  - Timestream Navigator must be on the battlefield
  - Leveler must be in your hand
  - You have the city's blessing.
[END OF COMBO PREREQUISITES]
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