T> Unique Ring 7 atk 15% STR for LUK

Hello, I was trying to cube my ring for LUK and after 10 cubes, I got this on the 9th. I'm trying to trade this for 12-15% LUK with similar or less attack.
http://i234.photobucket.com/albums/e.../STRUNIQUE.png


Thanks in advance!