Found this game by an accident almost 2 years ago and am still playing it.
Great game because:
- lots of cards (over 1200) and lots of combos (i.e. unlimited deck building);
- easy to get game basics;
- now with new expansion it is much easier for new guys to start and build good deck (free specialization cards);
- new tournaments system is introduced;
- single player is introduced (and is a good tutorial for new players btw);
- in addition to double gold during weekend, the daily rewards are introduced;
- the other you need to find out yourself while playing the game.
- it is addictive and takes a lot of time.