I play 3 on a regular basis Magmar, Abyssian and Vanar. Usually switch between those factions depending what I feel like playing. Also play Lyonar more over the last few weeks, while Vet I haven’t really touched since Shim’zar but is still my 3rd most played faction. Songhai is just a lost cause for me. Never enjoyed playing it, and I don’t like combo style decks anyway. So I’ve pretty much disenchanted every epic/legendary card for Songhai and moved the spirit into cards for other factions. Was so sad when I bought the one time offers from the Bronze, Silver, Gold packs and got Heaven’s Eclipse as the class legendary card.
But yeah, I play 5 factions and disenchant cards from the 6th to get more neutral/faction cards for other factions.