I just found it in the manual, but I don't know why it would be expected otherwise. It specifically says "#Burning + #Beast cards in game" instead of "#Burning + #Beast keywords in game", the former would mean that the number could never exceed 16, and only counted the number of cards. The latter is what actually happens. I think I made this realization some time before, but shortly forgot, and it came up a couple times lately. Since you intend it, could you fix the card text?