How can you create a combo with Umbris, Fear Manifest, Opposition Agent, Hive Mind, Mana Severance, Blade of Selves?
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[START OF COMBO]This combo can be formed with Umbris, Fear Manifest, Opposition Agent, Hive Mind, Mana Severance, Blade of Selves

Color identity: UB
Mana cost: {1}{U}
Steps:
  1. Cast Mana Severance by paying {1}{U}.
  2. Hive Mind triggers, causing each opponent to copy Mana Severance.
  3. Resolve each opponent's Mana Severance, searching for and exiling all land cards from their libraries.
  4. Resolve your Mana Severance, choosing not to exile any land cards from your library.
  5. Move to your combat step.
  6. Attack with Umbris.
  7. Umbris triggers, creating a token copy of Umbris for each opponent you have, with each token tapped and attacking a different opponent.
  8. Put all but one Umbris into your graveyard due to the legend rule.
  9. Umbris triggers for each Umbris token that enters and each Umbris token triggers for itself and each other Umbris that enters.
  10. Resolve the Umbris triggers, revealing no lands from opponent libraries and exiling each opponent library.[END OF COMBO STEPS]

Result:
  - Exile each opponent's library
  - Near-infinitely large Umbris[END OF COMBO RESULT][END OF COMBO]

Other prerequisites:
  - Umbris, Fear Manifest must be on the battlefield
  - Opposition Agent must be on the battlefield
  - Hive Mind must be on the battlefield
  - Mana Severance must be in your hand
  - Blade of Selves must be on the battlefield
  - Blade of Selves attached to Umbris.
  - Umbris does not have summoning sickness.
[END OF COMBO PREREQUISITES]
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