In our world, "making it rain" involves a stack of one dollar bills being thrown at scantily clad women in businesses of ill repute. In the world of the Transformers, it is a viable defense tactic used by the Decepticons when fighting the Autobots. Not the most environmentally friendly thing they could have come up with, but they are the bad guys after all.
The Loyal Subjects continues their successful line of Transformers toys with this Rainmaker 3 pack. These are on sale now for $45 and are an edition of 500. Get yours from https://www.theloyalsubjects.com/.