By deck building, you mean that there would be information carried between games, such as one's personal decks that they have already built?

I haven't yet built any features to allow storing player data outside of individual games, but that does seem a very useful thing that fits nicely with the goals of platform. I would have to think about what that might look like. Thanks for asking!

I think he meant Deck building is like magic the gathering. You gain cards each round and use that to your advantage. Also another popular deck building game is dominion online..