sylvanas is essential
the other legendaries are dependent upon the style of deck you want 2 play
most aggro decks like face hunter, patron warrior, aggro pally dont require legendary cards
Ya, I feel comfortable playing most, if not all the cheaper decks now. Face hunter, hybrid hunter, Zoolock, tempo mage, mech mage, etc.
Somehow after opening ~150 packs from arena + freebees I still don't have any giants, otherwise I'd go for Handlock.