This is an interesting deck, it’s the Trump Yogg Shadowfeast Priest Deck he was playing on stream. I’m always surprised more Priest decks don’t include Yogg, most a spell heavy and lack late-game damage. All things Yogg can provide, with ‘can’ being the main word there.
The deck includes Yogg, Shadowform, Priest of the Feast, Shadow Madness, all designed to help the deck be more aggressive and take control of the board.
It’s faster than other Priest of the Feast decks and a lot more fun, especially for newer Priest players in my opinion. Give it a try and see how you get on.