Romana II, There and Back Again, and Thornbite Staff

Prerequisites

• Romana II on the battlefield
• There and Back Again on the battlefield
• Thornbite Staff on the battlefield
• Romana II does not have summoning sickness
• 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, putting a lore counter on it
2. There and Back Again's third chapter ability triggers, creating a legendary 6/6 Smaug creature token and causing you to sacrifice There and Back Again
3. Activate Romana II by paying and tapping it, creating a token copy of Smaug with haste
4. Put either Smaug token into your graveyard due to the legend rule
5. When the Smaug token dies, it and Romana II trigger
6. Resolve the Smaug trigger, creating fourteen Treasure tokens
7. Resolve the Romana II trigger, untapping it
8. Activate a Treasure by tapping and sacrificing it, adding
9. Repeat from step 3

Results

• Infinite LTB
• Infinite ETB
• Infinite colored mana
• Infinite death triggers
• Infinite Treasure tokens