User blog comment:TAGDavid/How not to suck at building decks./@comment-25061243-20140718182028

Well I DO seek advice from friends, that's what the wikia community is for.

Maybe a deck around 50-55 would suffice for consistency reasons. 60+ would just be overwhelming 0-0

Some decks can survive with less monsters like Dungeon World with the help of mission cards. So it's not really a MUST.