Shantu's right, don't worry

. First, in case you rated the decks that defeated you, you only lost 30

. Second, I can imagine how you feel; at the moment I'm building decks which are able to compete in Gold league but am still lacking a good and consistent Silver farmer, most decks suggested in the forum seem outdated to me. When I started with playing Arena about three months ago, I had nice results with Flay 'Em! (
http://elementscommunity.org/forum/index.php/topic,20228.html) which does also well against Half-Bloods and can be built without upgrades (however, some upped Hourglasses are better) and Miracle (but if you have it, add it).
However, you cannot play Bronze to get

, only for rares and, most importantly, for the fun of encountering various decks and getting ideas from them. While doing this, you should ensure that you don't get bankrupt but with a good AI3 farmer (and according to your OP, you have one) you'll be able to cover the losses. And don't forget to fight your daily False God, of course, in the long run this will enable you to build better decks.