How can you create a combo with Rootha, Mercurial Artist, Mana Echoes, Through the Breach?
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[START OF COMBO]This combo can be formed with Rootha, Mercurial Artist, Mana Echoes, Through the Breach

Color identity: UR
Mana cost: {6}{R}
Steps:
  1. Cast Through the Breach by paying {4}{R}.
  2. Holding priority, activate Rootha by paying {2} and returning it to your hand, copying Through the Breach.
  3. Resolve the copy of Through the Breach, putting Rootha from your hand onto the battlefield.
  4. Rootha enters the battlefield, triggering Mana Echoes, adding at least {C}{C}.
  5. Repeat from step 2.
  6.  If you control two other Orcs and/or Shamans, this combo nets infinite colorless mana.[END OF COMBO STEPS]

Result:
  - Infinite colorless mana
  - Infinite enters the battlefield
  - Infinite leaves the battlefield
  - Infinite magecraft triggers
  - Infinite storm count[END OF COMBO RESULT][END OF COMBO]

Other prerequisites:
  - Rootha, Mercurial Artist must be on the battlefield
  - Mana Echoes must be on the battlefield
  - Through the Breach must be in your hand
  - You control at least one other Orc and/or Shaman.
[END OF COMBO PREREQUISITES]
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