There and Back Again | Song of the Worldsoul | Clockspinning

Cards

At the beginning of your precombat main phase,
There and Back Again triggers, creating a legendary 6/6 Smaug creature token, and causing you to sacrifice
There and Back Again.
Cast
Clockspinning with buyback by paying ({3} magic symbol) ({U} magic symbol) , targeting any applicable target.
Song of the Worldsoul triggers, creating a copy of the Smaug token.
Put a Smaug token into your graveyard due to the legend rule.
When the Smaug dies, it triggers, creating fourteen Treasure tokens.
Resolve
Clockspinning, returning it to your hand.
Activate four Treasure tokens by tapping and sacrificing them, adding ({3} magic symbol) ({U} magic symbol) .
Repeat from step 2.
Once you have infinite colored mana, you may use
Song of the Worldsoul's trigger to target any other token you control instead.