Activate Boromir by sacrificing it, 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.
This clever loop turns damage into an engine by letting Krark-Clan Shaman ping your own board to farm value. Boromir, Warden of the Tower provides the crucial safety net by sacrificing itself to grant your creatures indestructible, allowing them to weather the Shaman's repeated blasts. Meanwhile, Sonic the Hedgehog's passive haste grants its triggered ability to the team, so every single instance of damage dealt to your indestructible creatures triggers the generation of a tapped Treasure token. Because those Treasures can immediately be fed back into Krark-Clan Shaman as sacrifice fodder, the cycle becomes self-sustaining and endlessly repeatable.