Battle Decks Battle Decks include not only a well-composed deck ready for you to play, but also a folded paper playmat to play on, some helpful game tokens, a deck box to store your cards, and a nifty plastic coin (some Pokmon cards require you to flip a coin, and it's always better when you use a shiny Pokmon TCG coin instead of a regular penny)
Yes, some Pokmon TCG sets feature exclusive cards, such as limited-edition promos, alternate artwork, or unique holofoil patterns that can only be found in specific sets or special collections
Its not a perfect metric, but activity on this site mirrors the landscape in Master Duel quite nicely
Through the cunning use of half-assed research, I've found that Konami didn't exactly go nuts on improving the game after the first entry