Been playing both reno and dragon priest and tbh I am not impressed.
Rogue: Get owned by stealthed minion
Druid: Cant kill fast enough before the torrent of jade statues floods the board not to mention arcane golemns
Renolock: Jaraxxas is auto win for him
Hunter: COTW into another COTW not to mention 0 mana secrets
Paladin: Anyfin x 2 still kills you
warrior: face pirate warrior is 50/50. Either you have the answers or you lose by turn 4
Shaman: zooman more like
Mage: Spells/flame walker kills all your minion and cabalist tomb gives more spells.
So after trying to have board control and failing I finally had it and put together a OTK priest. With the pint size potion and sw:horror priest have an amazing mid game board wipe like paladin's equality-consecrate.
Strategies is this: early game draw cards/board wipe with dooomsayer
mid game: Against dragons (fk azure drake) use potion + horror. If not just use dragon fire potion
End game: velen or maly with spells. Deal at least 24 damage after discount. One time I managed to do a 30 damage burst. It's effective because most decks are very slow. decks you'll have trouble is hunter/pirate warrior and freeze mage (ice block). Other than that all other decks usually doesnt kill you fast enough before turn 9.
Reno dragon is doing very well for me.. albeit i dont have a massive amount of games w/ it yet.. it's doing well, tons of fun, and it seems to beat regular dragon priest which at least at my current rank seems pretty popular.