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

Color identity: UB
Mana cost: {B}{B}{B}
Steps:
  1. Cast Doomsday by paying {B}{B}{B}.
  2. Hive Mind triggers, causing each opponent to copy Doomsday.
  3. Resolve the first opponent's Doomsday, searching their library and/or graveyard for any five cards, exiling them due to Opposition Agent, exiling the rest of their library and graveyard, and causing them to lose half their life, rounded up.
  4. Repeat step 3 for each other opponent.[END OF COMBO STEPS]

Result:
  - Exile each opponent's library
  - Near-infinite lifeloss[END OF COMBO RESULT][END OF COMBO]

Other prerequisites:
  - Opposition Agent must be on the battlefield
  - Hive Mind must be on the battlefield
  - Doomsday must be in your hand
  - Your life total is at least 2.
[END OF COMBO PREREQUISITES]
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