How can you create a combo with Steelfin Whale, Retraction Helix, Mox Opal?
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[START OF COMBO]This combo can be formed with Steelfin Whale, Retraction Helix, Mox Opal

Color identity: U
Mana cost: {U}
Steps:
  1. Cast Retraction Helix by paying {U}, targeting Steelfin Whale.
  2. If you control three or more artifacts, activate Mox Opal by tapping it, adding one mana of any color.
  3. Activate Steelfin Whale by tapping it, returning Mox Opal from the battlefield to your hand.
  4. Cast Mox Opal by paying {0}.
  5. When Mox Opal enters the battlefield, Steelfin Whale triggers, untapping Steelfin Whale.
  6. Repeat from step 2.[END OF COMBO STEPS]

Result:
  - Infinite colored mana
  - Infinite storm count[END OF COMBO RESULT][END OF COMBO]

Other prerequisites:
  - Steelfin Whale must be on the battlefield
  - Retraction Helix must be in your hand
  - Mox Opal must be on the battlefield
  - Steelfin Whale does not have summoning sickness.
[END OF COMBO PREREQUISITES]
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