How can you create a combo with Rootha, Mercurial Artist, Sneak Attack, Seething Song?
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[START OF COMBO]This combo can be formed with Rootha, Mercurial Artist, Sneak Attack, Seething Song

Color identity: UR
Mana cost: {4}{R}
Steps:
  1. Cast Seething Song by paying {2}{R}.
  2. Holding priority, activate Rootha by paying {2} and returning it from the battlefield to your hand, copying Seething Song.
  3. Resolve the copy of Seething Song, adding {R}{R}{R}{R}{R}.
  4. Activate Sneak Attack by paying {R}, putting Rootha from your hand onto the battlefield.
  5. Repeat from step 2.[END OF COMBO STEPS]

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

Other prerequisites:
  - Rootha, Mercurial Artist must be on the battlefield
  - Sneak Attack must be on the battlefield
  - Seething Song must be in your hand
[END OF COMBO PREREQUISITES]
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