How can you create a combo with Timestream Navigator, Cellar Door, Celestine, the Living Saint?
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[START OF COMBO]This combo can be formed with Timestream Navigator, Cellar Door, Celestine, the Living Saint

Color identity: WU
Mana cost: {5}{U}{U} each turn
Steps:
  1. Activate Timestream 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 Cellar Door by paying {3} and tapping it, targeting yourself, putting Timestream Navigator from the bottom of your library into your graveyard and creating a 2/2 Zombie token.
  3. Declare Celestine as an attacker, dealing 3 damage and gaining 3 life when she does combat damage.
  4. At the beginning of your end step, Celestine triggers, returning Timestream Navigator from your graveyard to the battlefield.
  5. Move to your next turn.
  6. Repeat.[END OF COMBO STEPS]

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

Other prerequisites:
  - All permanants must be on the battlefield
  - Timestream Navigator and Celestine do not have summoning sickness.
  - Opponents cannot block and kill Celestine.
  - You have the city's blessing.
[END OF COMBO PREREQUISITES]
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