Such a waste ...
If your idea of a tower defence game is collecting and updating cards but not actually playing a tower defence game most of the time because you don't have the right card, or enough cards or enough daily life, or enough stars, or enough crowns, (all of which you can buy in the shop, of course, - apart from the daily life, which means you can't play whether you want to play or not - ), then this game is for you. For me it's a massively wasted opportunity as, when you do get to play, it's a good game.