I got an idea how about I don't become an animal and I can just use this talismin to communicate with animals like Dr. Dolittle?
The voice then says, "No we can not allow such action!"
You then say, If I can communicate with animals, and can remain human I can speak on your behalf which is more helpful then becoming an animal.
The voice then says, "Hmm purhaps you are right then you can bring more to us to transform. Very well you can leave, but remember you must bring us more to change or we will choose what you change into!"