It’s from the Teach/Tryout Set of July 2011. Information about all Teach/Tryout sets in general can be found in this article I wrote.
All three Teach/Tryout Sets of 2011 contain unique artworks not found elsewhere in the TCG (the Teach/Tryout Sets from 2000, 2008, and 2009 contains artworks of existing cards).
Greetz,
Quuador