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

Color identity: U
Mana cost: {U}
Steps:
  1. Cast Retraction Helix by paying {U}, targeting Steelfin Whale.
  2. Activate Mana Vault by tapping it, adding {C}{C}{C}.
  3. Activate Steelfin Whale by tapping it, returning Mana Vault from the battlefield to your hand.
  4. Cast Mana Vault by paying {0}.
  5. When Mana Vault enters the battlefield, Steelfin Whale triggers, untapping Steelfin Whale.
  6. Repeat from step 2.[END OF COMBO STEPS]

Result:
  - Infinite colorless 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
  - Mana Vault must be on the battlefield
  - Steelfin Whale does not have summoning sickness.
[END OF COMBO PREREQUISITES]
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