I tried that, and as a trading card game it's pretty good.

Unfortunately, Sony has utterly crippled it:

* You can pay extra (beyond subscription) to get super-cards.

* You are not allowed to trade most cards.

* Especially not the bought cards.

* Because their chat censor all numbers, semi-dirty words, words that from a distance can look like a semi-dirty word, it is completely impossible to converse with your opponent.