How can you create a combo with Ashnod the Uncaring, Bolas's Citadel, Galvanic Key?
user
[START OF COMBO]This combo can be formed with Ashnod the Uncaring, Bolas's Citadel, Galvanic Key

Color identity: UBR
Mana cost: {3}
Steps:
  1. Activate Bolas's Citadel by tapping it and sacrificing ten other nonland permanents you control.
  2. Ashnod the Uncaring triggers, copying Bolas's Citadel's ability.
  3. Resolve both Bolas's Citadel abilities, causing each opponent to lose 20 life.
  4. Each opponent that had 20 or less life loses the game due to having 0 or less life.
  5. Activate Galvanic Key by paying {3} and tapping it, untapping Bolas's Citadel.
  6. Activate Bolas's Citadel by tapping it and sacrificing itself, Manifold Key, and eight other nonland permanents you control.
  7. Ashnod the Uncaring triggers, copying Bolas's Citadel's ability.
  8. Resolve both Bolas's Citadel abilities, causing each opponent to lose 20 life.
  9. Each remaining opponent loses the game due to having 0 or less life.[END OF COMBO STEPS]

Result:
  - Each opponent loses the game
  - Near-infinite damage[END OF COMBO RESULT][END OF COMBO]

Other prerequisites:
  - All permanants must be on the battlefield
  - Each opponent's life total is no greater than 40.
  - You control at least 18 other nonland permanents.
[END OF COMBO PREREQUISITES]
assistant