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

Color identity: U
Mana cost: {9}{U}{U}{U} each turn
Steps:
  1. 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.
  2. Activate Planar Portal by paying {6} and tapping it, causing you to search your library for Timestream Navigator and putting it into your hand.
  3. Cast Timestream Navigator by paying {1}{U}.
  4. Repeat each turn.[END OF COMBO STEPS]

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

Other prerequisites:
  - All permanants must be on the battlefield
  - You have the city's blessing.
  - Timestream Navigator does not have summoning sickness.
[END OF COMBO PREREQUISITES]
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