How can you create a combo with Bolas's Citadel, Beacon of Immortality, Divining Witch?
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[START OF COMBO]This combo can be formed with Bolas's Citadel, Beacon of Immortality, Divining Witch

Color identity: WB
Mana cost: {6}{B}{W}
Steps:
  1. Activate Divining Witch by paying {1}{B}, discarding a card, and tapping it, choosing the name of a card not in your library, exiling your library.
  2. Cast Beacon of Immortality by paying {5}{W}, doubling your life total and shuffling Beacon of Immortality into your empty library.
  3. Cast Beacon of Immortality from the top of your library by paying 6 life, doubling your life total and shuffling Beacon of Immortality into your empty library.
  4. Repeat.
  5. If you have at least 7 life, this combo results in infinite lifegain.[END OF COMBO STEPS]

Result:
  - Exile your library
  - Infinite lifegain
  - Infinite lifegain triggers
  - Infinite magecraft triggers
  - Infinite storm count[END OF COMBO RESULT][END OF COMBO]

Other prerequisites:
  - Bolas's Citadel must be on the battlefield
  - Beacon of Immortality must be in your hand or in the library
  - Divining Witch must be on the battlefield
  - An additional card in hand.
  - Divining Witch does not have summoning sickness.
  - You have at least 6 life.
  - Note that mana and life prerequisite are different if Beacon of Immortality starts on top of your library.
[END OF COMBO PREREQUISITES]
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