You must have 5 or more lands with different names for this combo to work.
With Kodama and Field of the Dead in play, play Simic Growth Chamber.
With Chamber's trigger, return it to your hand.
Field of the Dead will trigger, create Zombie token
This will trigger Kodama's ability, which will allow you to put a permanent with a cost of 0 from your hand into play.
Put Simic Growth Chamber into play with Kodama's ability.
Repeat the process for infinite tokens.