I've made a simple tutorial to create this animated sprite sheet with unity 5 and shaderforge. It's my first attempt at a tutorial so I apologize if its convoluted or hard to use. I'd be happy to take questions if there are any. :)
you can find the PDF here:
https://www.dropbox.com/s/wppx3vso9klw7ql/Animated_Lightening_shader_tutorial_.pdf?dl=0