When Azorius Chancery enters the battlefield, it, The Necrobloom, 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 Azorius Chancery trigger, returning it from the battlefield to your hand.
Resolve the The Necrobloom trigger, creating a token.
When the token enters the battlefield, Kodama triggers, putting Azorius Chancery from your hand onto the battlefield.
When Azorius Chancery enters the battlefield, it and The Necrobloom trigger.
Repeat from step 4.
This loop relies on an elegant cascading trigger setup orchestrated by Kodama of the East Tree and The Necrobloom to continuously recycle a single bounce land. When you play Azorius Chancery, its own bounce trigger, The Necrobloom's landfall ability, and Kodama of the East Tree's permanent-entry trigger all go on the stack together. By letting Azorius Chancery return itself to your hand before the token from The Necrobloom enters the battlefield, that new token's arrival triggers Kodama of the East Tree to instantly drop Azorius Chancery right back onto the battlefield from your hand, restarting the entire cycle for endless landfall and creature tokens.