Storm-Kiln Artist triggers, creating a Treasure token.
Activate a Treasure by tapping and sacrificing it, adding 1.
Holding priority, activate Rootha by paying 2 and returning it from the battlefield to your hand, copying Seething Song.
Storm-Kiln Artist triggers, creating a Treasure token.
Resolve the Seething Song copy, adding .
Activate a Treasure by tapping and sacrificing it, adding .
Cast Rootha by paying 1.
Repeat from step 4.
This crafty spell-loop turns a burst of red mana into an infinite engine by constantly bouncing and re-casting its central artist. You kick things off by casting Seething Song, which feeds Storm-Kiln Artist's magecraft ability to immediately forge a Treasure token. While the original spell waits on the stack, Rootha, Mercurial Artist copies it and bounces back to your hand to pay her own activation cost, letting you recast her later with the help of Quicksilver, Speedster (who ensures your instant-speed timing and extra mana colors line up). Every iteration of this cycle generates more mana and triggers than it costs to repeat, ultimately yielding an infinite storm count and endless artifact and creature maneuvers.