Respawining foes?

[Keneth]

There's no way to do it as far as I know but I have been thinking of making an item with the sole purpose of fighting in an arena, you would upgrade it once to a different version and that version would upgrade back to the old version, making it an endless loop. This would be game breaking, more than it already is, but it would provide me with a better way to test my stuff and others with a way to exploit stuff. Actually, it might be better if it were more than just two versions and a different type of army each time....