Hearthstone Duels Decks for each class by Top Duels Player + Power Score
In each game of Hearthstone Duels, you start by building a 15 card Starter Deck and growing it each game until you either get 12 wins or 3 losses.
虎牙丶夜帆 is considered one of the best Hearthstone Duels Players in China. In an article he published, he shared with us Decks for each class you can play, including a Power Score from 1 (bad) to 5 (best).
For more information about Hearthstone Duels, here are some useful links: