I’ve not been big into Warcraft, at least not for quite a few years. However Bizzard has created a great online collectible card game based on the series, called Hearthstone. It’s a great game and can be played in five minute increments. Best of all, it’s one of the few “free” games that you can actually play without spending real cash. Yes, you can buy the collectible digital cards, however you can also purchase them with 100 gold (in game currency). The gold is easy to gather up. You get ten gold for every three games won. They also give you a daily quest that is easily completed and earns you 40-100 gold.
If you want to try it out, follow this link. You’ll get a free booster of digital cards, and I’ll earn a small reward too.