When I was a kid I would rent a VHS of Samurai Showdown – The Motion Picture all the time. The tape had some awesome trailers for other anime videos (including Neon Genesis). There was one trailer in particular that I can still remember the music too but can not recall the name what so ever.
It was a fantasy anime, and I remember an older person transforming into some type of saber-toothed cat I believe, distributed by A.D. Vision. unfortunately that's all I can remember. I think others transformed into animals as well? Any possible leads would be greatly appreciated!