Fight with a copy of the opponent
I think RIOT have to change system of battle with a copy of players becasue sometimes you can win the battle and you've gain nothing and opponent don't lose HP (but if you lose battle you lose your HP) and in the next battle with this opponent he can be stronger than you already. I think that system is not fair.
Also I think every player should to gain the same count of items from minions and monsters because sometimes someone gains 1 or nothing and others 3 or more.