User blog comment:Zebul/NARUTO YIN-YANG RELEASE/@comment-4080775-20170204052800

The Rinnegan grants you the capacity to utilize neature any Technique. Any Technique implied any Nature.

Also, when Naruto, as well as Obito and Madara Gaines Truth-Seeking Balls, they were GRANTED Yin-Yang Release, because Truth-Seeking Balls are composed of all five nature transformation + Yin-Yang Release. So techniques which grant use of the nature do exist.

Also, name one combined Nature Transformation that is composed of 2 elements, that shinobi can use at will. You won't find any in Canon because you can't use combined Nature transformations unless they are KG or KT-like in nature, requiring you to have some form of affinity for it at birth. Hago is a different story and gained use of it most likely when be gained the TSB's or due to inheriting great Chakra from Kaguya.

Also Bored, I don't care how long you've been reading or watching Naruto, you don't know everything about it and neither do I, but I know enough to navigate, whereas you previously stated that you can't even recall the names of the Tailed Beasts.