This is so great to hear!
Balancing a game (in this case, from cards to gameplay) is no easy feat, and I'm really happy to hear that you and your team have given it much thought (as I can tell from your response).

We will also probably modify the Elo system a bit to make sure it's fun and that players can feel like they are constantly progressing.

Awesome - this is going to keep players around fora long, long time.

Time to add that witness vote :D

Cheers,