There and Back Again, Song of the Worldsoul, and Man-o'-War

Prerequisites

• There and Back Again on the battlefield
• Song of the Worldsoul on the battlefield
• Man-o'-War in hand
• There and Back Again has exactly two lore counters on it
• 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 Man-o'-War by paying
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. When Man-o'-War enters the battlefield, it triggers, returning itself to your hand from the battlefield
7. Activate three 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 storm count
• Infinite Treasure tokens