Thats it, theres nothing else to say about.
Rng(essential in HS) is fun BUT it has a limit, and one of those limits is mana cheating. Litterally nowadays meta is manacheating.
hunter, plays big beats in turn 4-5= unfair
Rogue, knoll in early for 0-2 mana = unfair
Mage, 9 o 10 cost spells in turn 5-6, WHAT? Its not fun to do your plays when you now that next turn your opponents plays his rng wincondition that most of times freezes your field, destroys it, summon dragons, deals damage, etc.
Eventhoug its not broken it kills the entire fun of anyone that doesnt plays mage.