That is how you learn. Just keep playing and adjusting your deck. It is very easy to get free gold by leveling up and competing daily challenges to buy chests. After two weeks of playing you can easily level up your deck to compete with the best of them. I am pretty high ranked and I still get my but kicked by some of the players that play all factions including thorns. I have been playing for three months and I still adjusting my deck. I just try and learn from the players that I lose to.