How can you create a combo with Karador, Ghost Chieftain, Timestream Navigator, Isochron Scepter, Entomb?
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[START OF COMBO]This combo can be formed with Karador, Ghost Chieftain, Timestream Navigator, Isochron Scepter, Entomb

Color identity: GWUB
Mana cost: {5}{U}{U}{U} each turn
Steps:
  1. Activate Timestream Navigator by paying {2}{U}{U}, tapping it and putting it from the battlefield onto the bottom of your library, causing you to take an extra turn after this one.
  2. Activate Isochron Scepter by paying {2} and tapping it, casting a copy of Entomb without paying its mana cost.
  3. Resolve Entomb, searching your library for Timestream Navigator and putting it into your graveyard.
  4. Cast Timestream Navigator from your graveyard by paying {1}{U}.
  5. Repeat each turn.[END OF COMBO STEPS]

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

Other prerequisites:
  - Karador, Ghost Chieftain must be on the battlefield
  - Timestream Navigator must be on the battlefield
  - Isochron Scepter must be on the battlefield
  - Entomb must be exiled
  - Timesteam Navigator does not have summoning sickness.
  - You have not cast a creature spell using Karador this turn.
  - You have the city's blessing.
[END OF COMBO PREREQUISITES]
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