"And a emot chat system during the fight"
This is the worst chat idea that can possibly be implemented. It serves no purpose; emoting doesn't ever bring players into actual conversation with each other after the fight. It ends up allowing the opponent to be annoying and trollish during the matches.
Hearthstone has an emote system (while I think the community overall is less toxic here) and it is always heavily criticized. I feel like, a majority of my games there I have to "squelch" the opponent, so I don't have to listen to them try to use generic emotes as taunts.
Chat was great as it was in this game. It just needed to be more accessible.
I seriously believe emote chat would be a negative (mostly useless) addition.
Please don't implement emote chat. I have played Hearthstone ever since the beta and the emote system is one of the worst features of it. Nothing makes me want to quit more than the opponent repeatedly spamming emotes while I am trying to think about the game. Also, for the mobile players with sub-optimal internet connections, adding emotes can be more strenuous on the device and could result in more match disconnects.
However, if you do ignore this post and all the other players that are against emote chat, then please at least make it so that players can choose to completely turn off emote chat for themselves (like an account preference).
Oh and as a side note, #BringBackLDMissions