How can you create a combo with Grolnok, the Omnivore, Cephalid Illusionist, Lightning Greaves, Thassa's Oracle?
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[START OF COMBO]This combo can be formed with Grolnok, the Omnivore, Cephalid Illusionist, Lightning Greaves, Thassa's Oracle

Color identity: GU
Mana cost: {U}{U}
Steps:
  1. Activate Lightning Greaves by paying {0}, attaching it to Cephalid Illusionist.
  2. Cephalid Illusionist triggers, causing you to mill three cards.
  3. Whenever a permanent card is put into your graveyard, exile it with a croak counter.
  4. Activate Lightning Greaves by paying {0}, attaching it to Grolnok.
  5. Repeat step 1 through 4 until your devotion to blue is greater than or equal to the number of cards in your library.
  6. Cast Thassa's Oracle from exile by paying {U}{U}.
  7. Thassa's Oracle enters the battlefield, winning you the game.[END OF COMBO STEPS]

Result:
  - Infinite self-mill
  - Win the game[END OF COMBO RESULT][END OF COMBO]

Other prerequisites:
  - Grolnok, the Omnivore must be on the battlefield
  - Cephalid Illusionist must be on the battlefield
  - Lightning Greaves must be on the battlefield
  - Thassa's Oracle must be exiled or in the library
[END OF COMBO PREREQUISITES]
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