Mine is Nature. It might not be the best PVP faction like Fire or Ice, but it is the best PVE faction imo. Nature also has access to a lot of really powerful heal spells and curse of oink is nice cheap spell card that can buy you some much needed time. I also like a lot of the artwork for the Nature cards. So all in all Nature is my favourite.
As for the collor i like, its actually 2 of them ..Stoneskin (Frost and Nature)my GRINGER pwns all )
* Updated game trainers and cheats daily
* Get notified when new cheats are added
* Request which games get new trainers
* Priority support with any problem