I got an Onion knight card (5 star) from World of darkness and pretty much used that and 4 other cards to overpower most opponents, I'm only at 17 cards so far but have all the cards from the "lesser" card players, most frustrating as mentioned earlier are things like "random" where they pick from their deck of about 7 cards (where over half of them are 2 star or greater) and you get a bunch of 1 star trash and you are expected to win with that. I've not come across any that are "difficult" just sometimes it gets tedious when random means, every card except your decent ones.