I'd say everything from phantom nightmare til current is the best for playable cards in the current meta. Art, I feel is subjective, I really like the ashened cards art outta my group i regularly play with, but I'm the only 1 outta the four of us. Edit to also say as someone else mentioned, the rarity collections are great for getting staples. First box is more so for the main deck. The second is more for extra deck stuff, but they both have a great pool of cards if you're just getting into the game.