Board Thread:The Drawing Board/@comment-5029965-20130910103827/@comment-3271569-20130910141712

Basicly those elements are pretty default in every game:
 * Terra (early name "earth") common for any game
 * Flame (early name "fire") common for any game
 * Sea (early name "water") common for any game
 * Nature (early name "plant") common for any game
 * Ice, Electric common for any game
 * Metal and Dark: Less common
 * Legendary: Uncommon (they stole this from dragonvale I guess)
 * Pure: Uncommon
 * War: Rare
 * Light: Uncommon

So basicly with the exeption of the war freaking strange elements they didn't really go to the unqiue direction.