Two game mechanics that are not strictly OP but are just so damn toxic to fight against.

Riot goes through a tremendous effort tediously crafting champions that are great to play as while also not being a total bitch to play against. Considering the amount of champions in league at this moment compared to the amount of OP champions....I think they keep pretty fair tabs on this. However there are a couple of game mechanics that feel so wtf that it makes it hard to figure out how exactly Riot justified this to begin with.

1.) Clones - Creating an exact duplicate of yourself is certainly a fun thing to do and it is hilarious to watch enemy players try to track down your clone. It is NOT fun AT ALL for the other player however. Every time you create a clone of yourself the enemy player has to choose, do I pick A or B? Meaning that he/she has a 50/50 chance of picking the right target. "But Hay5eed!" I hear you roar "you are completely ignoring the fact that you can often figure out the right target by their actions"...but this is not true. Any player that knows how to play their champ will make it damned near impossible to figure out. Besides that how do you know that the enemy isn't just trolling by standing completely still while their clone runs away from you? You don't. You have literally no idea what the enemy is doing. Not knowing what the enemy is doing is perfectly fine when they are in the fog of war with no wards around. Not having vision when you need it is your fault. But even when you have vision of your target they press a button and POOF! Suddenly there are two of them and you haven't a clue what to do. They are not using brushes to hide from you, they are not hiding in fog of war, they are pressing a button (or sometimes not) to juke you and there is not a single thing you can do about it. Biggest offenders of this go to who can send her clone down to freaking bot lane from mid and whose clone is an essential part of his kit.

2.) Invisibility - When laning against someone with an invis, or invis traps, your only genuine options are to stock up on and hope for the best. Problem is that control wards cost gold and provide no benefit to your actual character, you can only have one active at a time, and it takes up a whole item slow. This means that you are wasting gold that you could be putting towards your core items, the ward itself doesn't provide any real bonus to you, and come late game you will have none of them because it will be replaced with your last item. Sure you have and it's upgrade but these are rarely useful and has long cooldowns. Are you an assassin playing against a mage? , you get some ad, mr, and cdr. It's not as good as a ghostblade or duskblade but it is STILL a good item with a mixture of defensive and offensive stats. Are you a mage laning against an assassin? , Ap, cdr, ar, plus the active. Laning against someone with an invis? Bleed gold into an item that doesn't help you at all.