How can you create a combo with Rukarumel, Biologist, Lurking Roper, Cryptolith Rite, Judge of Currents?
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[START OF COMBO]This combo can be formed with Rukarumel, Biologist, Lurking Roper, Cryptolith Rite, Judge of Currents

Color identity: WUBRG
Mana cost: 
Steps:
  1. Activate Lurking Roper by tapping it, adding one mana of any color.
  2. Judge of Currents triggers, causing you to gain 1 life.
  3. Lurking Roper triggers, untapping itself.
  4. Repeat.[END OF COMBO STEPS]

Result:
  - Infinite colored mana
  - Infinite lifegain
  - Infinite lifegain triggers[END OF COMBO RESULT][END OF COMBO]

Other prerequisites:
  - All permanants must be on the battlefield
  - Lurking Roper does not have summoning sickness.
  - "Merfolk" chosen with Rukarumel.
[END OF COMBO PREREQUISITES]
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