How can you create a combo with Zinnia, Valley's Voice, Timestream Navigator, Meticulous Excavation?
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[START OF COMBO]This combo can be formed with Zinnia, Valley's Voice, Timestream Navigator, Meticulous Excavation

Color identity: URW
Mana cost: {5}{W}{U} available the first turn, with {7}{W}{U}{U}{U} each following turn
Steps:
  1. Cast TImestream Navigator by paying {1}{U}, plus an additional {2} for its offspring cost.
  2. If you control ten or more permanents and don't have the city's blessing, Timestream Navigator gives you the city's blessing.
  3. When Timestream Navigator enters the battlefield, it triggers, creating a token copy of it that is 1/1.
  4. If you control ten or more permanents and don't have the city's blessing, the Timestream Navigator token gives you the city's blessing.
  5. Activate Meticulous Excavation by paying {2}{W}, returning the nontoken Timestream Navigator from the battlefield to your hand.
  6. During your next turn, repeat steps 1 through 5 one additional time.
  7. Activate the oldest Timestream Navigator token by paying {2}{U}{U}, tapping it and putting it from the battlefield onto the bottom of your library, causing you to take an extra turn after this one.
  8. Repeat from step 8.[END OF COMBO STEPS]

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

Other prerequisites:
  - Zinnia, Valley's Voice must be on the battlefield
  - Timestream Navigator must be in your hand
  - Meticulous Excavation must be on the battlefield
  - You control at least seven permanents and/or have the city's blessing.
[END OF COMBO PREREQUISITES]
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