I recently did a sweep of the links. I deleted anybody who: did not have the link up or was a dead link (404, 500, 403 error, etc.). This means even if you had 1000s of impressions waiting to be used, your link was deleted. I mess with the script, so people can get more impressions when they first start out. If you delete the link because you know you have a ton of impressions waiting for you, you are saying you don't apppreciate that or any of the other people who are showing your link. I don't delete closed sites because I know there is always a possiblity that they will return.
Your site MUST be a TCG.
You must own the TCG you're submitting.
Add the code as soon as you get it. The code must appear on your site EXACTLY as it appears when it is given to you or it will not work properly (so copy the code exactly as it is given to you and DON'T edit it).
Your username must be at least 5 letters long.
This is just a recommendation. You should probably put the code on the side or the main page, somewhere where you will get more impressions. The more impressions you get the more your banner is shown!