Verhey said it has a lot to do with past trends in similar sets, where one deck features the interesting new villains and the other has the heroes
The exile effect is important too, as it denies any 'on death' triggered abilities, and stops your opponent reanimating the creature later - very handy if said creature is Griselbrand 8
You & Mew Scan a wild Mew while carrying a custom Player Card (obtained from scanning another player) in your inventory
It bears the exact same characteristics and abilities, and even assumes the identity of both an artifact and an enchantment, giving the player a surprising amount of adaptability to the changing battlefield
Leafeon exs special art is particularly pleasant to look at
Firstly, energy cards are included in the main deck and must be found throughout the game through the use of Supporter Cards and Item Cards