I would say, as a player who plays every day mostly as a free to play, player that the plants need something to fight back. I've been playing for over a year, and gradually the game has become harder. It does seem since colossal has been released the zombies have been given a huge caffeine shot. Yes, its possible to fight back.. but how often does the deck draw let you down in those first few opening rounds..making it pointless to continue the game. The zombies have a lot of card draw/conjure beside tricks, then buff up their zombies.. I can be sat waiting my turn, while a zombie player plays card after card after card.. why can they do this? because they have so many brains due environments as well as other methods. I think your gonna find those who wish to play only as plants are going to stop playing, unless like me they've already invested alot of time into this game.