I'm using
HearthArena to help with the draft, so if there's stuff that's wrong with it, maybe send some info to the guys who run that site so they can adjust their algorithms and heuristics?
If I was trying to do it myself I'd be terrible at it.
Anyway it turned out awfully as real life intruded and lost me a game, and things just went downhill from there.
I made this suggestion in your chat, but the biggest thing that helped me improve at arena was working backwards through each of my plays. What I mean by that is, think about what your opponent will do in response to each of your lines of play and what the resultant board will look like afterwards. It's all about controlling the board in arena, so your most optimal play is always going to be the one that gives you a chance at holding the board or reclaiming the board.
Some examples from the couple games I watched:
Turn 7 against a Warlock. He had a 6/6 Floating Watcher and you played an Earthern Ring Farseer and then buffed it to a 7/7 with Blessing of Kings. This was a bad play because on his turn he easily could Life Tap to make his Watcher an 8/8, then kill your ERF for free and play another minion or two. The board would then be his 8/1 and 4/5 or 8/1, 3/2, and 3/3 to your nothing. You ended up not being punished by this play because he let your 7/7 live and you were able to lethal him (quite spectacularly, I might add) a couple turns later, but against a better player, this would have been a loss.
Turn 6 against a Mage. She had a 2/2 Razorfen Hunter and you played a Wild Pyro, a Loot Hoarder and hero powered instead of playing your Spectral Knight. This was a weak play because the Mage will just trade into your Wild Pyro, ping your Loot Hoarder and then play a 4-drop. The board would then be her 4-drop to your 1/1. Spectral Knight would at least survive the turn and you'd be able to attempt to gain back the board.
I also suggested you slow down and think about each turn. Use your full 90 seconds. Again, board control is so, so important in arena. You absolutely have to stop and think about each play and how it will affect the board in that turn and then even the next one or two turns after that. Plan your turns out well in advance. Think about what your opponent is likely to do in response to your plays that turn and then think about what
you will do in response to
that. Yes, it can be pretty mentally taxing, but it is the only way (I've found) to win consistently in arena.
Hope this helps!