Best Natureborn Decks
One of Natureborn's greatest traits is being able to adjust strategies mid-game. Having Minis that can adapt along with both of her forms can be a great way to utilize that ability. However, Natureborn as a whole is best at supporting her team despite each form.
So having Minis that synergize with her forms and can handle opposing Heroes themselves, will create a strong composition with Natureborn. These can be ranged Minis with Super abilities like Electro Wizard or melee Minis with a high attack speed like Valkyrie.
It is also important to keep in mind that the Energy and attack buffs Natureborn grants in each form require the Minis to be overhealed. So Minis that can guard or also heal others will be essential for obtaining those buffs.