Board Thread:Naruto Discussions/@comment-26005711-20160220134547/@comment-26636534-20160222124454

^Actually, Deidara was part of Iwagakure's explosion corps, meaning he had explosion release. Wanting to further his art, he stole the Iwagakure kinjutsu that allows the user to mold their chakra into objects, he molded his explosion release chakra into the clay and created the techniques he uses now. It is referenced on this wiki.