The good ol' Combo Priest has become so much more powerful alongside Rise of Shadows cards, such as Catrina Muerte and Archmage Vargoth. The first one allows your huge taunts return from the dead, while the latter one provides more free buff spells.
Of course, the Divine Spirit + Inner Fire combo is the main driving force of this deck, but so is the new Mass Resurrection spell that summons three minions back to life.
It's hard to imagine how much removal your opponents will need just to get rid of your minions. But for the OTK combo to work, you will probably need only one anyway, so board clears and removal spells are something you can deal with with ease.