How can you create a combo with Soulfire Grand Master, Jeska's Will?
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[START OF COMBO]This combo can be formed with Soulfire Grand Master, Jeska's Will

Color identity: URW
Mana cost: {4}{U/R}{U/R}{R}
Steps:
  1. Activate Soulfire Grand Master by paying {2}{U/R}{U/R}, causing you to put the next instant or sorcery card you cast from your hand this turn into your hand as it resolves.
  2. Cast Jeska's Will by paying {2}{R}, adding at least seven {R} and returning it to your hand.
  3. Repeat.
  4. If an opponent has eight or more cards in their hand, this combo nets infinite red mana.
  5. If you control a commander, you may choose both of Jeska's WIll's modes to exile your library.[END OF COMBO STEPS]

Result:
  - Exile your library
  - Infinite magecraft triggers
  - Infinite red mana
  - Infinite storm count[END OF COMBO RESULT][END OF COMBO]

Other prerequisites:
  - Soulfire Grand Master must be on the battlefield
  - Jeska's Will must be in your hand
  - An opponent has at least seven cards in hand.
[END OF COMBO PREREQUISITES]
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