The last time I entered into the Arena or Brawliseum, I wasn’t able to use any of my alternate Heroes that I had. Just recently I entered into the Arena and to my surprise I was able to select "Female Druid, Female Hunter, or Warlock.
I can now select any alternate Heroes that I paid for or work hard to acquire. 
How could you like the Tyrant Meta. Its pretty much if you don’t get offered Tyrants or something that discovers Tyrants you don’t make it past 3 wins. Arena is way to swingy now with a huge punish if you get a meh card quality draft.