A "transparent world-ish" materaial, is it possible?

Just like rendering a transparent world,
is a material possible that would render a “transparent world” when it was in front of other objects.
A plane with this material could be animated to reveal objects behind it, but the plane itself would render the same as a transparent world, and the world would be set to transparent under RENDER>FILM>TRANSPARENT and saved as .png w/RGBA.

Apply a holdout shader to the plane

Oh wow, thanks jandress, you rock!!!
I would have never thought it would be so easy.
I really appreciate the reply!