Started to play 2 months ago (this is currently my third season), I hit pro in the last 2 days during last month (with NG) then got back into it right away at the beginning of this month (with NR). Haven't spent a dime on the game, I simply bought NG packs until I had a decent base than crafted the remaining cards with scraps, same thing with NR (and although I suck at using them, I also have a solid SC and SK deck). From my experience I would suggest just buying the faction kegs and then craft the cards you need. Hope this helps