I really hate the new difficulty settings

Why is it that difficulty settings are now tied to extra mutations on top of the mutations that already exist the further you go on horde? It’s so stupid. Even on escape I believe difficulty and mutations should be two separate things. And why the hell are rarer cards locked behind the difficulty and mutations setting? And that still only gives you a SLIGHT chance of getting a rare card, don’t even get your hopes up for a epic or legendary. This is honestly depressing.