That looks okay to me. It's too bad you weren't offered Unleash as that would make this deck super good, but this looks pretty playable. I'd expect to go 4-5 wins with it. You've got really good potential to curve out every game, and playing BGH in Arena is super fun; there's always something to hit and it's always a huge turnaround.
Yeah this is one of those decks that averages 4 or 5, but can sometimes get 8 just by random chance. Or go 0-3, because luck is luck.
I drafted the most crazy good paladin arena deck yesterday. It was like guaranteed 10 wins plus. I had 4 murloc knights. And much other mcguffins (including BGH, for relevance).
It went 5-3.
1 loss to a topdecked turn 10 deathwing (I had an insurmountable board at this point, threatening lethal, and 6 cards in hand, but no taunt ((and no BGH, obvs) despite having only played 2 of I think 5 taunt creatures)).
1 loss to a turn 3 mana elemental, which went down to 1 health and every turn was buffed by at least 2 then reduced to 1 health again. It ended up a 7-1, behind 2 feral spirits. I drew nothing.
I can't remember what the other one was, I think it may have been just me misplaying, I was fairly annoyed at this point.