How can you create a combo with Mordenkainen, Doubling Season, Thassa's Oracle?
user
[START OF COMBO]This combo can be formed with Mordenkainen, Doubling Season, Thassa's Oracle

Color identity: GU
Mana cost: {4}{U}{U}{U}{U}
Steps:
  1. Cast Mordenkainen by paying {4}{U}{U}.
  2. Mordenkainen enters the battlefield with ten loyalty counters due to Doubling Season.
  3. Activate Mordenkainen's third loyalty ability by removing ten loyalty counters from it.
  4. Mordenkainen dies as a state-based action due to having zero loyalty.
  5. Resolve the Mordenkainen ability, exchanging your hand and library.
  6. Cast Thassa's Oracle by paying {U}{U}.
  7. Thassa's Oracle enters the battlefield, causing you to win the game.[END OF COMBO STEPS]

Result:
  - Infinite card draw
  - Win the game[END OF COMBO RESULT][END OF COMBO]

Other prerequisites:
  - Mordenkainen must be in your hand
  - Doubling Season must be on the battlefield
  - Thassa's Oracle must be in the library
  - Your devotion to blue is equal to or greater than the number of cards in hand minus two.
[END OF COMBO PREREQUISITES]
assistant