I'm far too lazy to write long & tedious reviews so i'll keep this short & sweet.
This is a card game that ACTUALLY feels like a real card game. If you played Magic the Gathering & have been looking for an alternative, this may be what you were searching for.
-First & foremost, the cash shop: all card packs can be bought with in game currency or money, the only thing that can only be bought with money is purely cosmetic. You get a free card every day & another for winning every day & they can be of any rarity (from what i've seen). Basically you can play the game without paying globs of $.
-I'm not going to go in depth of it's mechanics because 1. it's free you can play it yourself, 2. I'm lazy & 3. I suck at explaining mechanics & strategy, just know that it's fun.
-Graphics I guess? I mean it's a TCG but people expect mind blowing graphics sometimes. It's beautiful, the cards are all animated and the battlefield is in 3D. Also the game runs really well.
There's not really much else to say, I enjoyed it enough to write something about it & since it's out of Early Access (whoa that never happens).
APPEND: If your going to compare this to Hearthstone, don't. If your going to have a comparison, most would say Hearthstone is casual & this would be more towards... not casual, but that's just a
bad way to compare things.