very limited build paths for high level play, you can build most of the classes a couple of different ways but there are very limited options for making a strong priest build, thus making it predictable.
building a deck - to build a deck you need to go in "my collection" and click "new deck" on the right.
it takes you to a menu where you pick the class you want your deck to be for.
after doing so, you want to pick the best cards that you think that will go well in a deck, or use the helper, by just pressing "suggest a card" which will bring up a menu similar 