Hearthpwn

40 packs, 3 from arena events, 3 from single player missions, a legendary DK hero, a random legendary at 10 packs, and probably another random legendary by the time you open the other 36 packs, or just buy another 4 if you're incredibly unlucky.

Enough for what? To get the whole set? No.

To make a viable tier 1 deck? Probably, assuming you get lucky, have some previous set cards, and are prepared to craft a few essentials you miss.