How can you create a combo with Opposition Agent, Hive Mind, Mana Severance, Selective Memory?
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[START OF COMBO]This combo can be formed with Opposition Agent, Hive Mind, Mana Severance, Selective Memory

Color identity: UB
Mana cost: {4}{U}{U}
Steps:
  1. Cast Mana Severance by paying {1}{U}.
  2. Hive Mind triggers, causing each opponent to create a copy of Mana Severance.
  3. Resolve each opponent's Mana Severance, searching their libraries for all land cards, exiling them and shuffling their library.
  4. Resolve your Mana Severance, exiling no lands cards from your library and shuffling your library.
  5. Cast Selective Memory by paying {3}{U}.
  6. Hive Mind triggers, causing each opponent to create a copy of Selective Memory.
  7. Resolve each opponent's Selective Memory, exiling the rest of each opponent's library.
  8. Resolve your Selective Memory, exiling no nonland cards from your library and shuffling your library.[END OF COMBO STEPS]

Result:
  - Cast any number of spell(s) from opponents' libraries
  - Exile all nonland cards from opponents' libraries
  - Exile each opponent's library[END OF COMBO RESULT][END OF COMBO]

Other prerequisites:
  - Opposition Agent must be on the battlefield
  - Hive Mind must be on the battlefield
  - Mana Severance must be in your hand
  - Selective Memory must be in your hand
[END OF COMBO PREREQUISITES]
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