There is a general feeling that Hearthstone emotes are limited and there seems to be a lot of room for improvement in it. The 2016 'sorry' emote removal adds up to the feeling that one could have more ways to communicate with his opponent during a game. Even with the risk of some major BM's, it's probably worth it.
And here are some suggestions:
1. Hurry up!
2. That was lucky.
3. That just happened.
4. Figers crossed
5. Hold my beer!
6. Great topdeck!
7. Nice RNG there.
8. Not fair.
9. Do you want fries with that?
10. Noooooo!
So what do you think of these? Add up some of your suggestions in the comments if you will and let's hope that some day Blizzard will expand this part of the game too.