Cast Grand Crescendo by paying {W}{W}, giving creatures you control indestructible until end of turn.
Activate Krark-Clan Shaman by sacrificing an artifact, dealing 1 damage to each creature without flying.
Sonic's second ability triggers for each creature you control with haste or flash that was dealt damage, creating that many tapped Treasure tokens.
Repeat from step 2.

Infinite tapped Treasure tokens

Infinite damage to creatures

Sonic the Hedgehog

Krark-Clan Shaman

Grand Crescendo

At the beginning of your upkeep, Mayael's Aria triggers.
Holding priority, cast Grand Crescendo by paying {5}{W}{W}, creating five 1/1 Citizen creature tokens.
When the Citizens enter the battlefield, Devilish Valet triggers that many times, doubling its power that many times, causing its power to be at least 32 until end of turn.
Resolve the Mayael's Aria trigger, causing you to put a +1/+1 counter on each creature you control, gain 10 life and win the game.

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