How can you create a combo with Rootha, Mercurial Artist, Hellkite Courser, Krark-Clan Ironworks, Saheeli's Artistry?
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[START OF COMBO]This combo can be formed with Rootha, Mercurial Artist, Hellkite Courser, Krark-Clan Ironworks, Saheeli's Artistry

Color identity: UR
Mana cost: {6}{U}{U}
Steps:
  1. Cast Saheeli's Artistry by paying {4}{U}{U}, targeting Hellkite Courser.
  2. Holding priority, activate Rootha by paying {2} and returning it to your hand, targeting Saheeli's Artistry.
  3. Choose to have Rootha returned to the command zone instead of your hand.
  4. Resolve the Rootha ability, copying Saheeli's Artistry, targeting Hellkite Courser.
  5. Resolve the copy of Saheeli's Artistry, creating a token copy of Hellkite Courser that is also an artifact.
  6. The Hellkite Courser token enters the battlefield, putting Rootha from the command zone onto the battlefield.
  7. Activate Krark-Clan Ironworks by sacrificing the Hellkite Courser token, adding {C}{C}.
  8. Repeat from step 2.
  9. Optionally, you may choose both modes of Saheeli's Artistry to create infinite tokens of any artifact(s) on the battlefield.[END OF COMBO STEPS]

Result:
  - Infinite colorless mana
  - Infinite copies of any artifact(s) on the battlefield
  - Infinite death triggers
  - Infinite enters the battlefield
  - Infinite leaves the battlefield
  - Infinite magecraft triggers
  - Infinite sacrifice triggers[END OF COMBO RESULT][END OF COMBO]

Other prerequisites:
  - Rootha, Mercurial Artist must be on the battlefield
  - Hellkite Courser must be on the battlefield
  - Krark-Clan Ironworks must be on the battlefield
  - Saheeli's Artistry must be in your hand
[END OF COMBO PREREQUISITES]
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