The phrase "whole plethora" means having a lot of something or a wide variety of something. It represents a large amount or range of options or choices. Full definition
Surprisingly, the Library of Congress offers a whole plethora of photographs to help your content stand out — and not just on the Fourth of July. (entrepreneur.com)
As a Pagan, if you attend a public ritual you go in knowing full well that a whole plethora of different deities might be called upon. (rachelheldevans.com)
The scriptures got creation wrong and there is a whole plethora of flawed information which follows. (religion.blogs.cnn.com)