How can you create a combo with Timestream Navigator, Molten Echoes, Crystal Shard?
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[START OF COMBO]This combo can be formed with Timestream Navigator, Molten Echoes, 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, Molten Echoes triggers, creating 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
  - Molten Echoes 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.
  - "Human", "Pirate", or "Wizard" chosen with Molten Echoes.
[END OF COMBO PREREQUISITES]
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