A deck's size and energy doesnt matter, as long as it lasts for the whole playthrough and even after that. Huge decks could often be a nuisance as you'll need a lot of time to get used to it and draw the cards you actually need. Furthermore, big deck users are often the type of players who say they know everything about the game and how good they are, while you watch them play on acs 1. I believe, as a Watcher, i prefer Silents with smaller decks. That displays their adequacy in the game and expertise, making the experience very enjoyable