Use product entity field as filter in Views
I recently learned how to do this kind of thing.

You need Page Manager which comes as part of Chaos Tools for d7, and Panels.


In Page Manager, enable and edit the path /node/%node
Set the selection criteria to node-type = showcase
Create a context based on the entity reference field, or if that doesn't work you might need the Relation module.
Create another context based on the power field (you might like to use a taxonomy for that)
Make a view that uses the context to choose the products to display
Back in page manager, under Content, use Panels to determine where and how you want node and the view to display.


Follow the first link ("learned") for a much more thorough tutorial.