As far as I know the only reason to not do any balance changes before release(wipe) is that it was promised a very long time ago.
There is few things I want to point out:
every change to cards invalidate all leader-boards
every change to cards make it difficult to run replays, EA make it so you can not open them at all
From my point of view doing changes now will limit these problems after release.
Some changes like changing HP, or cost of something are for me just 1
https://discord.gg/GZKKMqH I do not think the results will change significantly without any progress, so here is the link to discord server that will be related to balancing the game. I decided for discord (as first try) because of the advanteges mentioned, mainly rules enforcing.
I will try the discord now, and based on the results I may decide if move whole discussion to forum or not. Results will be posted on forum eiter way, before implemented, so even if you do not join the discord you