Topic on Extension talk:Variables

No, but a feature like this could be added and is tracked in T191575.

Sample page using variables: http://tales-of-link.wikia.com/wiki/%28Artes_Wand_User%29_Agria

That's not supported by the extension. You'd need to write a new extension on top of Variables to achieve this but it's not impossible.

It's an interesting thought to save the distinct var_final values in page_props to make it queryable… Maybe I will put some effort in implementing this additional functionality at some point in the future.

This is tracked in T191575.