What Discmania has to say about the new Sky God IV:

The Rainmaker is a putter designed by none other than Eagle McMahon, one of the most deadliest players on the putting green. Eagle got the opportunity to design a disc of his dreams and he used it well, by designing the world’s best putting putter. The Rainmaker is a slightly lower profile, straighter and beveled version of a P2.

“What makes the Rainmaker special to me is the fact I was heavily involved in the design process. The Rainmaker represents everything I want in a putter. I will primarily use it for putting, but the shape of the disc also makes it an incredible point and shoot throwing putter with great glide.”
-Eagle McMahon
Good for: Control backhand and forehand drives, upshots, scramble shots, Putting