Cast Your Temple Is Under Attack by paying 2, 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.
By casting Your Temple Is Under Attack to grant your entire team indestructible, you set the stage for total devastation through mechanical synergy. Krark-Clan Shaman acts as the engine, repeatedly sacrificing artifacts to deal 1 damage to every creature without flying—including your own indestructible board. Because Sonic the Hedgehog gives itself and your other creatures haste, its second ability triggers every time that damage is dealt, creating a flood of tapped Treasure tokens that you can immediately feed back into the Shaman.