How can you create a combo with Muldrotha, the Gravetide, Timestream Navigator, Riptide Shapeshifter?
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[START OF COMBO]This combo can be formed with Muldrotha, the Gravetide, Timestream Navigator, Riptide Shapeshifter

Color identity: BGU
Mana cost: {4}{U}{U}{U}{U} the first turn, with {7} plus six {U} available each extra turn
Steps:
  1. Activate Timstream 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 Riptide Shapeshifter by paying {2}{U}{U} and sacrificing it, naming any of Timestream Navigator's types, and then revealing Timestream Navigator from your library and putting it onto the battlefield.
  3. Move to your next turn.
  4. Cast Riptide Shapeshifter from your graveyard by paying {3}{U}{U}.
  5. Repeat.[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.
  - You do not have any Human, Pirate, or Wizard creature cards in your library
[END OF COMBO PREREQUISITES]
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