Requires

There and Back Again must be on the battlefield. Song of the Worldsoul must be on the battlefield. Clockspinning must be in hand. There and Back Again has exactly two lore counters on it. Mana needed:

Steps

1. 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.
2. Cast Clockspinning with buyback by paying , targeting any applicable target.
3. Song of the Worldsoul triggers, creating a copy of the Smaug token.
4. Put a Smaug token into your graveyard due to the legend rule.
5. When the Smaug dies, it triggers, creating fourteen Treasure tokens.
6. Resolve Clockspinning, returning it to your hand.
7. Activate four Treasure tokens by tapping and sacrificing them, adding .
8. Repeat from step 2.
9. Once you have infinite colored mana, you may use Song of the Worldsoul's trigger to target any other token you control instead.

Results