For Chillmaw thats a though one. Definitelly not Healbot. You want Chillmaw for defense & taunt. So probably even Infested Tauren seems better although it will ruin your Healing Waves …

Same for Cairne .. quiet hard to replace … you may as well torn out N’Zoth and go without it …

Add Ragnaros, Nefarian, … possibly Earth Shock / Frost Shock … to get more control over aggressive opponets …

Not really. You can go for Cult Aphotacary … that seems the closest one …

Amazing deck.

Well it’s a Burn Priest.