I don't really like it, the font is clichéd harry potter font. I also don't really see the relevance of the 'avada kedavra' on this design. maybe if it had 'the boy who lived... etc.' on a shirt with harry's face it would work, but I don't like this design.
Regardless, it's alright as a picture, but I don't like it as a shirt. It's too simple, and kind of boring.