Requires

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 Dimir Aqueduct.
3. Kodama of the East Tree, the Kodama of the East Tree token, and Dimir Aqueduct 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 Dimir Aqueduct trigger, returning it to your hand.
6. Resolve the Kodama of the East Tree trigger, putting Dimir Aqueduct onto the battlefield.
7. The Kodama of the East Tree token and Dimir Aqueduct trigger.
8. Resolve the Dimir Aqueduct trigger, returning it to your hand.
9. Resolve the Kodama of the East Tree token's trigger, putting Dimir Aqueduct onto the battlefield.
10. Kodama of the East Tree and Dimir Aqueduct trigger.
11. Repeat from step 5.
12. At the beginning of your combat phase, Helm of the Host triggers, creating a nonlegendary token copy of Kodama of the East Tree with haste.
13. Play Dimir Aqueduct.
14. Both Kodama of the East Trees and Dimir Aqueduct trigger.
15. Resolve the token Kodama of the East Tree trigger, choosing not to put anything from your hand onto the battlefield.
16. Resolve the Dimir Aqueduct trigger, returning it to your hand from the battlefield.
17. Resolve the nontoken Kodama of the East Tree trigger, putting Dimir Aqueduct from your hand onto the battlefield.
18. The token Kodama of the East Tree and Dimir Aqueduct trigger.
19. Resolve the Dimir Aqueduct trigger, returning it to your hand from the battlefield.
20. Resolve the token Kodama of the East Tree trigger, putting Dimir Aqueduct from your hand onto the battlefield.
21. The nontoken Kodama of the East Tree and Dimir Aqueduct trigger.
22. Repeat from step 5.

Results