To be honest, “from the beginning” is quite vague. When we started developing Mops & Mobs, there was no card game at all and it wasn’t really planned either; but later on it dawned on us that we need some kind of gameplay to solve conflicts (and the existing mechanics didn’t suffice for that). We then, after some deliberation, borrowed a lot of gameplay from our former game “Mondar’s Dungeon” and tried to bend them into a system that can be used to play out various encounters in Mops & Mobs, and the idea with the single broom card came when we did some paper prototypes. After implementing it we called it a day, because other things needed our attention too. But after some playtesting, mostly by ourselves, it became clear that some changes were needed to make it more dynamic, and changing the deck building was a big part of it.
And yes, I’m 100% sure Micah’s comment is AI, and they probably won’t even care about an answer, but it gave me the opportunity to talk about dev stuff, so I took it.