Recs.
Updated
HEX: Shards of Fate is a successfully crowd funded MMO trading card game that is free to play.
SpecsUpdate
Pros
Pro Easy tournament style, you can finish your tournament over multiple days/weeks if its needed
Pro Large variety of gameplay and formats
Between the cash tournaments, the ladder with rewards for both limited and constructed play, draft gauntlets, sealed and evolution gauntlet, as well as the single player campaign, playing the auction house, and the 'sandbox' Frost Ring Arena, there is a lot to engage in.
Pro Can easily maintain 100+ creatures on the board incase its needed (like with vennen)
Pro Good tutorial
There are tutorials in the game that are pretty extensive in teaching one how to play the game. For many TCGs may seem pretty complicated, luckily HEX helps new players get accustomed to the game.
Pro Very profitable compared to other games
Thanks to player Platinum:Gold market, While grinding in HEx you will net around $1/hour whereas in Hearthstone the same time will only see a return of around 20¢/hour.
Cons
Con Clunky deckbuilding interface.
While they are updating the deck builder frequently, search mechanics and sorting could be better. Such as the ability to make new decks in campaign, instead of just clicking a button and starting from scratch, you must manually remove all the cards in the deck and then remember to save as a new deck.
Con Questionable long-term viability
At this point, hard to see the game ever really taking off. Balancing and card development is increasingly questionable, especially in limited formats (such as the current set emphasizing RNG in the Conscript mechanic as a game decider). The game developers have essentially conceded they can't deliver much of what was promised on the PvE side while also struggling to translate efforts there into income.
The client interface (e.g. chat, auction house, etc.) remains atrocious. Multiple featured tournaments have been compromised by bugs. This seems like a classic case of reach exceeding grasp, and investing heavy resources into the game is probably not the safest play.
Con Easy to learn, very very hard to master
No instant gratification, which some specific type(s) of players seek in their games. You have to go deep to reach a point where every play will feel like a personal win.