When Simic Growth Chamber enters the battlefield, it, Thranduil the Strategist, and Kodama of the East Tree trigger.
Resolve the Kodama of the East Tree trigger, choosing not to put anything from your hand onto the battlefield.
Resolve the Simic Growth Chamber trigger, returning it from the battlefield to your hand.
Resolve the Thranduil the Strategist trigger, creating a token.
When the token enters the battlefield, Kodama of the East Tree triggers, putting Simic Growth Chamber from your hand onto the battlefield.
When Simic Growth Chamber enters the battlefield, it and Thranduil the Strategist trigger.
Repeat from step 4.
This ingenious loop relies on Kodama of the East Tree as a recursive bridge between your lands and your token generation, turning a single bounce into an endless engine. When you drop Simic Growth Chamber, its own bounce trigger resets the land back to your hand while Thranduil the Strategist takes advantage of the landfall to churn out a 1/1 Elf creature token. That very token's entry into the battlefield immediately fires off Kodama of the East Tree's ability, allowing you to cheat Simic Growth Chamber right back onto the battlefield from your hand without paying its mana cost.