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

Color identity: GU
Mana cost: {2}{U}{U} each turn
Steps:
  1. At the beginning of your upkeep, Progenitor Mimic triggers, creating a copy of Timestream Navigator.
  2. Activate the ability of any Timestream Navigator that has not entered this turn by paying {2}{U}{U}, tapping it, and putting it on the bottom of your library, taking an extra turn after this one.
  3. 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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