The rules are very simple, Collect 7 unicorn cards to win. There are cards that other players can use to stop you from collecting the other unicorns, and there are other cards that have in-game effects which affect your play style.
The $50 tier is the most complete set of cards you will have. It comes with 3 expansions, a small set of kickstarter special edition cards (which you unlock by being a backer and reaching stretch goals) and an NSFW deck.
With all cards combined, you wouldnt be able to fit them in one box, however, if you omit the NSFW version and only keep the original deck with the expansion sets, it all should be able o fit snugly. Keep the NSFW cards separate in case you want a quick clean game with kids and family.
Typical gamer that lives in the internet who also crawls outside once in a while.