The EU Summer prelims will be played out over the 13th and 14th August 
2016. You can watch all the action on the Hearthstone Twitch Channel.
Here is the RDU EU Summer Prelims Dragon Warrior Deck he will be using to try and advance to Blizzcon. Remeber, tournament decks are not always the strongest ladder decks, but there is a lot you can learn from playing with these decks.
This Dragon Warrior deck is pretty standard to what you see on ladder. It’s one of, if not the strongest overall META deck right now and I expect almost every player to bring a version close to this.