Easy to Learn, Hard to Master

Hi guys, It gets thrown around a lot, this champ is easy to learn, but hard to master. Which champ(-s) do you think this is especially true for? I remember being set on buying {{champion:23}} when an opponent totally rekt my team, but I mean like he carried, ganked, jungled he truly was our "worst nightmare". When I finally got {{champion:23}} though I found that although his mechanics are easy to get one's head around, being good with him is an altogether different story. I was rightly flamed for playing horribly for quite a few games, but preserved and finally mastered him (I consider mastering a champ as having at least an S- rating and level 5 mastery with said champ). Other champs that fit this category in my opinion: {{champion:1}} {{champion:22}} {{champion:24}} {{champion:107}} {{champion:2}} Which champs do you guys find easy to learn, but hard to master?
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