How can you create a combo with Spellbinding Soprano, Sprout Swarm, Runaway Steam-Kin?
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[START OF COMBO]This combo can be formed with Spellbinding Soprano, Sprout Swarm, Runaway Steam-Kin

Color identity: RG
Mana cost: {3}{R}, plus an additional {X} available, where X is equal to three minus the number of +1/+1 counters on Runaway Steam-Kin
Steps:
  1. Activate Spellbinding Soprano's encore ability by paying {3}{R} and exiling it from your graveyard, creating a token copy of it with haste for each opponent you have.
  2. Declare each Spellbinding Soprano token as an attacker.
  3. Each Spellbinding Soprano token triggers, causing instant and sorcery spells you cast this turn to cost {1} less to cast for each Spellbinding Soprano token.
  4. If Runaway Steam-Kin has three or more +1/+1 counters on it, activate its ability by removing three +1/+1 counters from it, adding {R}{R}{R}.
  5. Cast Sprout Swarm by paying {1} and tapping a green creature you control.
  6. Runaway Steam-Kin triggers, putting a +1/+1 counter on itself.
  7. Resolve Sprout Swarm, creating a 1/1 Saproling creature token and returning Sprout Swarm to your hand.
  8. Repeat from step 4.[END OF COMBO STEPS]

Result:
  - Infinite enters the battlefield
  - Infinite magecraft triggers
  - Infinite storm count
  - Infinite tapped creature tokens[END OF COMBO RESULT][END OF COMBO]

Other prerequisites:
  - Spellbinding Soprano must be in the graveyard
  - Sprout Swarm must be in your hand
  - Runaway Steam-Kin must be on the battlefield
  - You have at least three opponents.
  - You control at least one untapped green creature.
[END OF COMBO PREREQUISITES]
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