Hearthpwn

 After finally acquiring Morgl  I discovered he has a special interaction with Sir Finley Mrrgglton.

If your opponent plays Sir Finley Mrrgglton instead of Finley saying his usual line he says "Greetings old friend, how about a cup of tea after the match?"

I'm not sure if i'm the first one to find this or not but it's certainly interesting.

I wish they would add way more card and hero interactions

And against Garrosh there's two.

Cairne Bloodhoof shouts "Garrosh! you are not fit to lead the horde!"

And Vol'jin says "Who be da warchief now?" coupled with a chuckle.

Quote from pstamcar >>

isn´t there also smth between lord jaxx and that summoner legendary (willfred or whatever)?

Varian Wrynn has also a special interaction with Anduin, he says "Your skills have grown" or something like that.

Sadly, Sylvanas doesn't say anything special to her sister Alleria.

Brann Bronzebeard has an interaction when played against Magni he says "Oh, brother! Have you heard from Muradin lately?"

When facing Lord Victor Nefarian if you play Deathwing, he'll quote "D-Daddy"

Quote from willremember >>

When facing Lord Victor Nefarian if you play Deathwing, he'll quote "D-Daddy"

If you play Alextrasza against Vaelastrasz he will say "Help me, Lifebinder! HELP!"