The recording starts after regaining the towers in phase 2. I have finally killed Onyxia following the guide provided by Bulava here: • The EASIEST Onyxia kil... Average deck level 25.0.
What do you mean by booster only player? Yes, I bought the legendary value booster and a couple of other good offers, but that doesn't mean that I automatically win this extremely hard fight that took more than 12 hours or tries until I learned every small adjustment needed in order for the AI to spawn what I want, where I want. It is a very annoying fight and very different from the Heroic campaign which seemed hard at first, before trying Onyxia.