Frequent Crashes (Freezes) Before Games Start

Hello! I have a couple of questions regarding the decks I'm making. For some reason, almost every deck I make (with a few exceptions) crash the game when I try to play a game with them. It's quite aggravating, since all the time I've put into the deck is suddenly meaningless and I can't tell what's causing the problem. I do believe my games crash with transform cards, but I stay away from those. Now it feels like any card will just crash the game. Is there a way to fix this? Also, what's the fastest way for me to get all of the new content/updates since Aether Revolt?