here is pr7 page. my keyword wow power leveling. if I guess right, it should take site from page 5 to page 4 at least.
It's not an English site. It's about English but the title and description are not English. What might be happening is that your SERPs went up for a regional version of Google, rather than Google USA (google.com) Though Google USA does display foreign language sites in SERPs, but these are much lower down. Also, how long has your link been there and when did google last index the site? The link won't affect SERPs unless google knows that it's there. But I think it's largely the foreign language issue.