While I am quite happy with my current life pet, curiosity drives me to mix it with another pet for fun.
What in your opinion is a good mix for a spirit of nature for a life wizard?
This wizard went with the ice to tower shield and death to feint build.
Whether the Spirit of Nature is the ultimate life pet is debatable depending on its talents. Obviously if there are talents that your pet currently has then the wisest choice for hatching would be to find another pet with a similar talent base. And if there is a talent you'd LIKE to see manifested in a new pet then the obvious choice would be hatching with a pet that has that talent. There are no guarantees but there is a chance you'll get a mix of the talent base from both pets. As a general rule it's going to take multiple hatchings to get the "perfect" mix.