X-Saber might become meta so that's what I'm focusing on, maybe Unnexpected Dai as well. I Think that you should get at least one of Stardust and Uruquizas as well.
I pretty much disagree with everything Slowking just said. I doubt X-Saber will be meta, you dont need more than 1 copy of Stardust if you're F2P (get 1 from unlocking Yusei) and Uruquizas isn't that good of a card.
Blues Eyes seems to be the only deck looking like it'll take over the meta.
If I we're you I'd wait a week or so to scout out what is doing well
I don't really know yet cuz most of the cards are new to me and I don't know anything about X-Saber archetype or synchro monsters so I can use some advice !
Yeah, Blue Eyes will definitely be the next big thing. If you're going in on this box I'd make sure you get 3 copies of The Stone Of The White Legend, atleast 1 copy of Silver's Cry, 1 Azure-Eyes, 3 Priestess, 3 Protecter. Can level up Seto to get Melody Of Awakening Dragon. Obviously 3 copies of everything would be best but that is just if you're F2P.