The number one thing I look for in a deck is interesting court cards. I want something there that I haven't seen before. If the court cards are unique, whether it's the colour palette or the artwork, I'm probably going to buy it.
Other things that come into it are the card back, I love marked decks and numbered decks.
Awesome aussie site for playing cards.
Quick postage aswell
Only issue was the packaging, each deck was individually wrapped in bubble wrap. It was great to see such excellent care for the cards, but it seems a little excessive, personally I prefer how buyworthy used to post cards, in a nice box without individual wrapping.
Great in general!