Kodama of the East Tree, Helm of the Host, and Arid Archway

Prerequisites

• Kodama of the East Tree on the battlefield
• Helm of the Host on the battlefield
• Arid Archway in hand
• Helm of the Host attached to Kodama of the East Tree

Steps

1. At the beginning of your combat phase, Helm of the Host triggers, creating a token copy of Kodama of the East Tree that isn't legendary
2. Play Arid Archway
3. Kodama of the East Tree, the Kodama of the East Tree token, and Arid Archway trigger
4. Resolve the Kodama of the East Tree token's trigger, choosing not to put anything from your hand onto the battlefield
5. Resolve the Arid Archway trigger, returning it to your hand
6. Resolve the Kodama of the East Tree trigger, putting Arid Archway onto the battlefield
7. The Kodama of the East Tree token and Arid Archway trigger
8. Resolve the Arid Archway trigger, returning it to your hand
9. Resolve the Kodama of the East Tree token's trigger, putting Arid Archway onto the battlefield
10. Kodama of the East Tree and Arid Archway trigger
11. Repeat from step 5

Results

• Infinite landfall triggers