Be prepared to be really irritated. From D5 down, its a cancer ward. Every mouth-breather deck is on display one after another. All busted, all ridiculous. Of course, YOU can play one of those decks too but then the problem becomes: Wins and losses are 100% out of your control. Whoever draws their busted shit first wins Or, with polarized match ups the game is over before it even starts. That happens a lot too.
Im using a Reno Hunter deck that gets me to D3-D2 but thats it. Full wall of Paladins and Priests. There is almost nothing I can do against either deck. Paladins buff their 1 cost minions so they are like 8/8 and many have charge. WHAT the $%^&* is that? And Priest? yeah, right. Vargoth makes that Res crap obscene. Even if i stay patient and can Sylvanas one of their big minions or Hex one with Zephyrs..... they still manage to crank out big minion after big minion and then res them like 37 times.
So, just.... use Paladin(handBuff or unlimited divine shield and buffs to recruits) or Res priest. Secret mage can work too b but even my Reno Hunter deck wrecks them like 65% of the time.