Currently you only need 40 cards if you're playing multiplayer matches. You can still play against the AI and the minimum deck size is 30 there. We will be updating starter decks to 40 cards soon.

I pulled up your game account under the same email address as your forum account and it looks like you haven't claimed your free Shadow Crystals yet and can do so here.

aaah okay .. sounds good to me )
thank you sir