When Dakmor Salvage enters, Chocobo Racetrack and Kodama trigger.
Resolve the Kodama trigger, choosing to put nothing onto the battlefield.
Holding priority, activate Overgrown Estate by sacrificing Dakmor Salvage.
The Gitrog Monster's second ability triggers, causing you to mill two cards and return Dakmor Salvage from your graveyard to your hand.
If a land was milled this way, The Gitrog Monster's second ability triggers, causing you to draw a card.
Resolve the Overgrown Estate ability
Resolve the Chocobo Racetrack trigger, creating a token.
When the token enters the battlefield, Kodama triggers, putting Dakmor Salvage from your hand onto the battlefield.
When Dakmor Salvage enters the battlefield, Chocobo Racetrack triggers.
Repeat from step 4.
This loop is a masterclass in recursion, turning Dakmor Salvage into an endless revolving door fueled by Dredge 2. Whenever the land enters the battlefield, Chocobo Racetrack triggers to create a Bird token, which in turn lets Kodama of the East Tree cheat Dakmor Salvage right back into play from your hand. Meanwhile, sacrificing that land to Overgrown Estate feeds life into your pool while letting The Gitrog Monster's draw trigger replace itself with a dredge, triggering itself all over again whenever a land hits your graveyard.