Orthion, Hero of Lavabrink, There and Back Again, and Thornbite Staff

Prerequisites

• Orthion, Hero of Lavabrink on the battlefield
• There and Back Again on the battlefield
• Thornbite Staff on the battlefield
• 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 Orthion's first ability 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 Orthion trigger
6. Resolve the Smaug trigger, creating fourteen Treasure tokens
7. Resolve the Orthion trigger, untapping it
8. Activate two Treasures by tapping and sacrificing them, adding
9. Repeat from step 3

Results

• Infinite artifact ETB
• Infinite artifact LTB
• Infinite artifact sacrifice triggers
• Infinite artifact tokens
• Infinite colored mana
• Infinite death triggers
• Infinite creature ETB
• Infinite creature LTB
• Infinite Treasure tokens