How can you create a combo with Timestream Navigator, Gravecrawler, Fiend Artisan?
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[START OF COMBO]This combo can be formed with Timestream Navigator, Gravecrawler, Fiend Artisan

Color identity: BGU
Mana cost: {4}{U}{U}{B}{B/G} each turn
Steps:
  1. Activate Timestream Navigator 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.
  2. Activate Fiend Artisan by paying {2}{B/G} and sacrificing Gravecrawler, causing you to search your library for Timestream Navigator and put it onto the battlefield.
  3. Cast Gravecrawler from your graveyard by paying {B}.
  4. Repeat each turn.[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 and Fiend Artisan do not have summoning sickness.
  - You control at least one additional Zombie.
[END OF COMBO PREREQUISITES]
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