This is the Zetalot Priest of the Feast w Thoughtsteal Deck he was playing 
on stream. Finding space for Thoughtsteal in Priests decks usually pays off. Thoughtsteal is one of the strongest Priest cards, and this list performed very well at high legend ranks.
Zetalot is one of the best Priest players, so his deck lists are always of interest. This list uses the new card, Priest of the Feast too which has turned out to be a lot better than people thought.