Is there an option for a monthly subscription? I don't want to pay a year up front and the 12 second ads every page navigation is unbearable. Thanks!

Yearly subscribtion only, unfurtunately.

Same here, I'd love a monthly option; especially since I'm only looking for low cost cards. 

What does the subscription  include? 

 it will allow you to add over 5000 cards, will do auto match when you click on someones profile, or you can click on Matching bar and it will reflect how many cards others have for you (vice versa). much easier and faster to make trade deals