Remove (or change) Cursed Blade from the game.
Cursed Blade is a flawed design. It defeats the entire point of spending your earned gold on upgrades when a simple item like that can reduce my 3 star unit to lower star. You are basically rewarding the player for finding bow and cloak. Meanwhile I upgrade two units to 3 star, thinking that I am ahead and could start winning fights, instead I lose to a much worse team, only because my 3 star unit is now lower star.
A lot of people have been complaining about this, me personally I would like the item to never exist.