There and Back Again, Song of the Worldsoul, and Clockspinning

Prerequisites

• There and Back Again on the battlefield
• Song of the Worldsoul on the battlefield
• Clockspinning in hand
• available

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

• Infinite colored mana
• Infinite copies of tokens you control
• Infinite death triggers
• Infinite ETB
• Infinite LTB
• Infinite magecraft triggers
• Infinite proliferate
• Infinite storm count
• Infinite Treasure tokens
• Infinite power for creatures you control until end of turn