There has been a rise in high legend Priest decks since the class received new cards from the Karazhan adventure. This is the Sjow Karazhan Concede Priest Deck as he called it, he was ranking up really fast and hitting win streaks on his way to legend.
It’s a fairly typical high-value resurrect Priest deck. He has added some big taunts and tech cards like Baron Geddon to deal with aggro, and Ragnaros. This type of Priest isn’t too hard to play, it’s a good one to start with if you’re new to Priest.