So the early access is public? Should try it out for sure then. Not that into card games, but Fable might change my mind.
It's a decent card game! I haven't tried PvP or Co-Op (yet), but training might be hit or miss. The Guildmaster is very challenging if you've never played a card game before. However, it is pretty good for figuring out how each hero in addition to the moral system. They also rotate out their events every 10 days, and everyone will be reset to level 1 for balancing.
They give you experience for every win or defeat, and they'll give you additional cards. It's very, very doable to win with your current cards, so you won't feel the need to buy a decent deck to actually perform. Plus, the game gives you opportunities to earn new cards. The card duplicates are given after each match, but if you want hero oriented cards, you'll have to open your fortune pack.
Overall, I'm having a blast. I gave my spare key to my sister (she's a Fable fan too) to try co-op today. The developers did recommend doing co-op to learn the ropes of the game. I have no qualms with grouping up with anyone if they want to do co-op on Steam!