Do Monster Cards Do Anything Yet?

It's pretty obvious to me that the game is keeping track of which cards you picked up and how many (otherwise you couldn't get the consecutive buffs), so I say yes: Whenever they bother putting the actual Book into the game, people should already find those Magatia cards in their collections.

I've found six cards so far. Turns out I didn't get the speed boost if I had a potion. xD