Saheeli, the Sun's Brilliance, There and Back Again, and Thornbite Staff

Prerequisites

• Saheeli, the Sun's Brilliance on the battlefield
• There and Back Again on the battlefield
• Thornbite Staff on the battlefield
• Saheeli does not have summoning sickness
• There and Back Again has exactly two lore counters on it
• Thornbite Staff attached to Saheeli
• 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 Saheeli 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 Saheeli trigger
6. Resolve the Smaug trigger, creating fourteen Treasure tokens
7. Resolve the Saheeli trigger, untapping it
8. Activate two Treasures by tapping and sacrificing them, adding
9. Repeat from step 3

Results

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