bonafide11
Worker
A +15% city attack for all units would be a beyond lame UA. One dimensional and no imagination. But essential if not allowed to found cities.
Hyperbole aside, it is clearly not a UA with "no imagination" as there is no current UA that resembles anything close to it. It would be the most unique UA in the game currently. While you may not care for it particularly, it would make playing as the Huns unlike playing with any other civ in the game, which takes imagination and would be fun.