How can you create a combo with Rona, Herald of Invasion // Rona, Tolarian Obliterator, Retraction Helix, Mox Amber?
user
[START OF COMBO]This combo can be formed with Rona, Herald of Invasion // Rona, Tolarian Obliterator, Retraction Helix, Mox Amber

Color identity: UB
Mana cost: 
Steps:
  1. Activate Mox Amber by tapping it, adding {U}.
  2. Cast Retraction Helix by paying {U}, targeting Rona.
  3. Activate Rona by tapping it, returning Mox Amber from the battlefield to your hand.
  4. Cast Mox Amber by paying {0}.
  5. Rona triggers, untapping itself.
  6. Activate Mox Amber by tapping it, adding one mana of any color among legendary creatures and/or planeswalkers you control.
  7. Repeat from step 3.[END OF COMBO STEPS]

Result:
  - Infinite mana among colors of legendary creatures and planeswalkers you control
  - Infinite storm count[END OF COMBO RESULT][END OF COMBO]

Other prerequisites:
  - Rona, Herald of Invasion // Rona, Tolarian Obliterator must be on the battlefield
  - Retraction Helix must be in your hand
  - Mox Amber must be on the battlefield
  - Rona does not have summoning sickness.
[END OF COMBO PREREQUISITES]
assistant