Runaway Steam-Kin + Spellbinding Soprano Combos

2 known combos featuring both cards in Commander

Infinite magecraft triggers Infinite storm count Infinitely powerful creatures you control until end of turn Infinite ETB Infinite tapped creature tokens

Combo 1 with Seething Anger

Also requires: Seething Anger Seething Anger
Results: Infinitely powerful creatures you control until end of turn · Infinite magecraft triggers · Infinite storm count
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 Seething Anger with buyback by paying {R}.
  6. Runaway Steam-Kin triggers, putting a +1/+1 counter on itself.
  7. Resolve Seething Anger, giving target creature +3/+0 until end of turn and returning Seething Anger to your hand.
  8. Repeat from step 4.

Combo 2 with Sprout Swarm

Also requires: Sprout Swarm Sprout Swarm
Results: Infinite ETB · Infinite magecraft triggers · Infinite storm count · Infinite tapped creature tokens
Show 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.
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