All the whining about cards being OP seems a bit premature, what with the expansion only being released yesterday. However, I do have some small nit-picks to bring up.
1) The Spell Animations
With a few exceptions, all of the new spells either have reused or minimal animation. Perhaps, Counterplay decided to patch spell animations in later so that the expansion can be released earlier, but it feels kind of weird dropping an 8 mana spell and seeing the same animation as a 2 mana one. Again, this is probably done so that the expansion can launch sooner, so we’ll have to wait and see.
2) The Hidden Information
This is a bit of a formating suggestion. Cards that summon Tokens should probably tell you what tokens they summon. It seems a bit hard to keep track of all the tokens as the number of cards grows. The most confusing instance of this are the “random ability” effects. Pandora, Grailmaster, Kron, and Elkowl all use this phrase in their description, so you would think that they draw from the same pool of keywords. Nope. There are three pools of random keywords, with Kron and Elkowl having their own individual pools. This can be immensely confusing even to experienced players.
3) The Nit-Picks about Art
Some specific units come to mind. For instance, Rex is seen as a formidable Theropod, with a stocky build like a T-rex. Instead, Rex looks quite underfed, lacking the muscles in his art. Rae is even more different. In the concept art, Rae is seen as a vast serpent with a skull as a face looming over the other battle pets, rivaling even Hydrax in size. However, the actual unit is a puny worm that coughs on enemies to attack. I know that this is severely picky, but things like this just make me laugh.