Forum:Element boost in battle?

I have a question: is there an attack/defense boost by having all cards of the same element as your account? ie. Fire account all Fire cards. During battle, there is this phase that says "Element Match > Stats Boosted" that seems to pick only the cards that match your element. How does this boost affect the final attack/defense? Is there a great benefit of having all five cards of the same element?

Also, how are the skills activated? If all five cards have skills, how many will be activated -- I think I've seen a max of three skills activated before, can there be five? and if not, what decides which skill gets activated?

I read the battle wiki page but doesn't really answer this question. Any help appreciated!