What you are looking for is usually called a strap line.
A good starting point for these is to concentrate on what the unique selling point of your site is. Ask yourself why should someone use your site over your competitors - and then try to make the answer sound catchy. Ta-da instant strapline.
Looked at your site and am still trying to work out what you are offering?
Chat about poker?
Playing Poker in teams?
I dont get it?
Only logo i can think of is "Blind leading the blind"
You want us to give you a strap line but we dont even know your domain name. Perhaps if you set your site out with clearer information, secured a domain name you might get some help.