There and Back Again, Song of the Worldsoul, and Shrieking Drake

Prerequisites

• There and Back Again on the battlefield
• Song of the Worldsoul on the battlefield
• Shrieking Drake 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 Shrieking Drake 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 Shrieking Drake enters the battlefield, it triggers, returning itself to your hand from the battlefield
7. Activate a Treasure by tapping and sacrificing it, 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