How can you create a combo with Valley Floodcaller, Retraction Helix?
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[START OF COMBO]This combo can be formed with Valley Floodcaller, Retraction Helix

Color identity: U
Mana cost: {U}
Steps:
  1. Cast Retraction Helix by paying {U}, targeting a Bird, Rat, Otter and/or Frog you control that does not have summoning sickness.
  2. Valley Floodcaller triggers, giving Birds, Otters, Frogs and Rats you control +1/+1 until end of turn and untapping them.
  3. Resolve Retraction Helix.
  4. Cast the noncreature permanent by paying {0}.
  5. Valley Floodcaller triggers, giving Birds, Otters, Frogs and Rats you control +1/+1 until end of turn and untapping them.
  6. Activate the creature targeted by Retraction Helix by tapping it, returning the noncreature permanent cast in step 4 from the battlefield to your hand.
  7. Repeat from step 4.[END OF COMBO STEPS]

Result:
  - Infinite storm count
  - Infinite untap of Birds, Otters, Rats and Frogs you control
  - Infinitely large Birds, Otters, Rats and Frogs you control until end of turn[END OF COMBO RESULT][END OF COMBO]

Other prerequisites:
  - Valley Floodcaller must be on the battlefield
  - Retraction Helix must be in your hand
  - You control a Bird, Rat, Otter and/or Frog that does not have summoning sickness.
[END OF COMBO PREREQUISITES]
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