How can you create a combo with Opposition Agent, Sudden Substitution, Selective Memory?
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[START OF COMBO]This combo can be formed with Opposition Agent, Sudden Substitution, Selective Memory

Color identity: UB
Mana cost: {5}{U}{U}{U}
Steps:
  1. Cast Selective Memory by paying {3}{U}.
  2. Holding priority, cast Sudden Substitution by paying {2}{U}{U}, exchanging control of Selective Memory and target creature an opponent controls.
  3. Resolve Selective Memory, choosing to have the opponent exile all nonland cards in their library due to Opposition Agent.[END OF COMBO STEPS]

Result:
  - Exile all nonland cards from target opponent's library, with the ability for you to play them from exile[END OF COMBO RESULT][END OF COMBO]

Other prerequisites:
  - Opposition Agent must be on the battlefield
  - Sudden Substitution must be in your hand
  - Selective Memory must be in your hand
  - An opponent controls a creature.
[END OF COMBO PREREQUISITES]
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