How can you create a combo with Barrin, Master Wizard, Myr Battlesphere, Mana Echoes?
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[START OF COMBO]This combo can be formed with Barrin, Master Wizard, Myr Battlesphere, Mana Echoes

Color identity: UR
Mana cost: {7}
Steps:
  1. Cast Myr Battlesphere by paying {7}.
  2. Myr Battlesphere enters the battlefield, triggering itself and Mana Echoes.
  3. Resolve the Myr Battlesphere trigger, creating four 1/1 Myr creature tokens.
  4. The four Myr tokens enter the battlefield, triggering Mana Echoes four times.
  5. Resolve all Mana Echoes triggers, adding at least 25 {C}.
  6. Activate Barrin by paying {2} and sacrificing a Myr token, returning Myr Battlesphere from the battlefield to your hand.
  7. Repeat.[END OF COMBO STEPS]

Result:
  - Infinite colorless mana
  - Infinite creature tokens
  - Infinite death triggers
  - Infinite enters the battlefield
  - Infinite leaves the battlefield
  - Infinite sacrifice triggers
  - Infinite storm count[END OF COMBO RESULT][END OF COMBO]

Other prerequisites:
  - Barrin, Master Wizard must be on the battlefield
  - Myr Battlesphere must be in your hand
  - Mana Echoes must be on the battlefield
[END OF COMBO PREREQUISITES]
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