Wow, Card Hunter is excellent. For a beta, it’s extremely polished. The only complaints I have are nitpicks, so I won’t bother listing them here.
It’s just an RPG-style fighting strategy game, but the deck mechanic is fun. You have a party of up to three PCs, each with their own card deck. You build your deck by equipping your PC with gear — each item grants a fixed set of 3-6 cards. Winning a battle grants you new items.