How can you create a combo with Mirran Spy, Retraction Helix, Phyrexian Walker, Reckless Fireweaver?
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[START OF COMBO]This combo can be formed with Mirran Spy, Retraction Helix, Phyrexian Walker, Reckless Fireweaver

Color identity: UR
Mana cost: {U}
Steps:
  1. Cast Retraction Helix by paying {U}, targeting Reckless Fireweaver.
  2. Activate Reckless Firereweaver by tapping it, returning Phyrexian Walker from the battlefield to your hand.
  3. Reckless Fireweaver triggers, dealing 1 damage to each opponent.
  4. Cast Phyrexian Walker by paying {0}.
  5. Mirran Spy triggers, untapping Reckless Fireweaver.
  6. Repeat from step 2.[END OF COMBO STEPS]

Result:
  - Infinite damage
  - Infinite enters the battlefield
  - Infinite leaves the battlefield
  - Infinite storm count
  - Infinite tap triggers[END OF COMBO RESULT][END OF COMBO]

Other prerequisites:
  - Mirran Spy must be on the battlefield
  - Retraction Helix must be in your hand
  - Phyrexian Walker must be on the battlefield
  - Reckless Fireweaver must be on the battlefield
  - Reckless Fireweaver does not have summoning sickness.
[END OF COMBO PREREQUISITES]
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