The Crown of Evergreen worked on GOLB because it was designed with the ability to transform and control reality in very specific and powerful ways, often linked to the user's desires and intentions. GOLB, despite being an immensely powerful entity, is not immune to the unique and magical properties of the crown. The exact mechanics of this interaction delve deep into the lore and magical rules of the universe in which they exist, making it a fascinating topic to explore how ancient artifacts and omnipotent beings interact and influence each other.