what if somebody the weapon after it's in play? How would the return weapon effect work?
Interesting point...
The way I was thinking this card would work is to put some kind of a counter on the weapon and a corresponding counter on the stunned creature
By that logic, I suppose the duplicated weapon would receive the same counter and therefore be linked to the stunned creature as well... so both would get returned.
Of course, if there is a good reason to not have it work like that (balancing, thematic, or otherwise) I am certainly open to a different scheme.