Hearthpwn

bruh it's important but not that much in this game. you still get the same cards that you didn't want to keep or get like pairs, high cost cards, etc. A simple popular example, I hardly mulligan for weapon destroyer against some decks and you just never get it, if the game decided so... to be exact you get it right after the weapon is already destroyed and your opponent got full value from it. So nah, it's a bit anoying but not game changing or op or anything. If only the game had like a rule: if you shuffle a card on a mulligan you will not get that card right back like in the 1st turn or a simmilar principal than you could say it's " very, very important". 

you get a "fake" class card.  

It's basically 1 turn effect, still pretty cool, I don't care if it's annoying or toxic or whatever, I love it. I wish I could choose that fake class tho.