Love the art you found. Very vibrant blue. Awesome.
The mechanic has been suggested before, although maybe not exactly in this manner. But, it still will have some of the same issues as previous attempts.
Namely, it can be abused with Dim. Shield and Sundial.
Even if this were single-use and fractal and mitosis weren't an issue, it still would allow the owner to extend dim shield and sundial for 6 times as long.
I think returning opponent's permanents isn't a big issue, but the possible abuse with Dim. Shield, and sundial is.
Other than that issue, I think this would make a nice addition and give
some needed soft PC.
Not sure what to do to get around the potential abuse though...