Spellbinding Soprano, Seething Anger, and Runaway Steam-Kin

Prerequisites

• Spellbinding Soprano in the graveyard
• Seething Anger in hand
• Runaway Steam-Kin on the battlefield
• You have at least three opponents
• , plus an additional amount of equal to three minus the number of +1/+1 counters on Runaway Steam-Kin available

Steps

1. Activate Spellbinding Soprano's encore ability by paying 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 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
5. Cast Seething Anger with buyback by paying
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

Results

• Infinitely powerful creatures until end of turn
• Infinite magecraft triggers
• Infinite storm count