Betrayers of Kamigawa is the thirty-fourth Magic expansion, released in February 2005 as the second set and first small expansion in the Kamigawa block. The prerelease was on January 22, 2005.
Betrayers of Kamigawa contains 165 black-bordered cards (55 commons, 55 uncommons, 55 rares). Its expansion symbol is a "shuriken" or "shaken" to evoke the set's ninja theme. A shuriken is a traditional Japanese concealed weapon that was generally used for throwing, and sometimes stabbing or slashing. Shuriken is the name given to any small-bladed object, while shaken is traditionally used to indicate the "throwing star". The set introduced the Ninjutsu and Offering keywords.