First of all, I would say make the entry of the game a bit more noob friendly. Add a optional tutorial and prologue, readjust a few gold costs across the board to be more friendly. Advertise it a little better and offer a reward for poping in and playing for your first few hours, maybe a few sg to experiment with.
Then, regarding things not already suggested, most of which i agree with:
Artifacts and stats were originally part of the game plan. Artifacts gave some kind of positive effect for some kind of negative effect, while stats worked as you would expect, but with different stats then you might expect.
I would like the card aspect to be more customization. Switch parts or even all of a characters deck in and out. Add more cards to the game.
The ability to turn off match chat should you so choose. Also, NPC match chat, maybe have some npcs offer advice or belittle you as it goes on? choose between having pve or pvp chats non or off if you do this.
Also a way to trade spare cards for stuff. I have 42 100 attack cards and no use for them.
< Message edited by megakyle777 -- 10/3/2018 10:30:22 >