How can you create a combo with Timestream Navigator, Flameshadow Conjuring, Crystal Shard?
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[START OF COMBO]This combo can be formed with Timestream Navigator, Flameshadow Conjuring, Crystal Shard

Color identity: UR
Mana cost: {2}{U}{U} each turn, plus an additional {3} or {U} available each turn
Steps:
  1. Cast Timestream Navigator by paying {1}{U}.
  2. If you don't have the city's blessing and control ten or more permanents, Timestream Navigator gives you the city's blessing.
  3. When Timestream Navigator enters the battlefield, Flameshadow Conjuring triggers, causing you to pay {R} to create a token copy of Timestream Navigator with haste.
  4. If you don't have the city's blessing, the Timestream Navigator token gives you the city's blessing.
  5. Activate Crystal Shard by paying {3} or {U} and tapping it, returning the nontoken Timestream Navigator to your hand from the battlefield.
  6. Activate the Timestream Navigator token by paying {2}{U}{U}, tapping it and putting it on the bottom of your library from the battlefield, causing you to take an extra turn after this one.
  7. 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
  - Flameshadow Conjuring must be on the battlefield
  - Crystal Shard must be on the battlefield
  - You have the city's blessing and/or control at least eight permanents.
[END OF COMBO PREREQUISITES]
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