Often when I stamp I do a couple of images and pop the unused ones into a 'toppers' container on my craft desk. Lately I have noted down the name of the stamp used on the back of them but not this one. I do think it might have been from a Hero Arts set.
The Spellbinders die behind the image is Resplendent Rectangles. The sentiment is Gina K Enjoy the Sunshine which was die cut using MFT Fishtail Flags.