How can you create a combo with Rootha, Mercurial Artist, Mana Echoes, Rishkar's Expertise?
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[START OF COMBO]This combo can be formed with Rootha, Mercurial Artist, Mana Echoes, Rishkar's Expertise

Color identity: GUR
Mana cost: {6}{G}{G}
Steps:
  1. Cast Rishkar's Expertise by paying {4}{G}{G}.
  2. Holding priority, activate Rootha by paying {2} and returning it to your hand, copying Rishkar's Expertise.
  3. Resolve the copy of Rishkar's Expertise, causing you to draw cards equal to the greatest power among creatures you control and casting Rootha without paying its mana cost.
  4. When Rootha enters the battlefield, Mana Echoes triggers, adding {C} for each Orc and/or Shaman you control.
  5. Repeat from step 2.
  6. If you control two other Orcs and/or Shamans, this combo nets near-infinite colorless mana.[END OF COMBO STEPS]

Result:
  - Infinite card draw
  - Infinite draw triggers
  - Near-infinite colorless mana
  - Near-infinite enters the battlefield
  - Near-infinite leaves the battlefield
  - Near-infinite magecraft triggers
  - Near-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
  - Rishkar's Expertise must be in your hand
  - You control at least one other Orc and/or Shaman.
[END OF COMBO PREREQUISITES]
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