The Reserve is a game changer. Looking at the new promos, for example "The Watchman", gives you on demand access to Major/Minor prophets who could all be in your Reserve along with Ezekiel, allowing you to potentially pack your deck with battle winners, but still only have say 50 cards. HSR isn't stopping you from going there, and you can go to prophets you may need situationally in some games, that you may not need in others. This is only examining the potential power of one card, "The Watchman", where as we see many cards spoiled already interacting with it as well and on equal if not in some cases far greater power levels
