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

Color identity: UB
Mana cost: {1}{U} plus an additional {1}{U} for each opponent you have
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. Activate Umbris by paying {1}{U}, blinking Umbris.
  6. Umbris triggers, revealing no lands from an opponent library, exiling their library.
  7. Repeat from step 5 for each opponent.[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
  - Deadeye Navigator must be on the battlefield
  - Deadeye Navigator is paired with Umbris.
[END OF COMBO PREREQUISITES]
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