How Bad Is Power Creep in Hearthstone?

Power creep is one of the biggest problems in trading card games and can detrimentally affect their longevity and overall playability. Pokemon has been a prime example of this with decks now chock full of EX and GX cards and many no longer even utilizing one of the core fundamental mechanics of Pokemon: evolving. While power creep has taken many years and sometimes even decades to become extremely noticeable in other games such as Magic: The Gathering, Hearthstone has simpler game mechanics which puts it at higher risk of power creep compared to other TCGs and CCGs.