How can you create a combo with Timestream Navigator, Grenzo, Dungeon Warden?
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[START OF COMBO]This combo can be formed with Timestream Navigator, Grenzo, Dungeon Warden

Color identity: UBR
Mana cost: {4}{U}{U} each turn
Steps:
  1. Tap Timestream Navigator to take an extra turn, putting it on the bottom of your library.
  2. Activate Grenzo to return Timestream Navigator to the battlefield.
  3. Move to your next turn.
  4. Repeat for infinite turns.[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.
[END OF COMBO PREREQUISITES]
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