Manaless Champions
I am only a silver but I have LONG contended that mana-less champs, provided an unfair advantage, primarily in solo lanes. Typically it is attested that there are some "trade offs" for not having to manage mana althought I personally don't agree with this.
Now we are dealing with the nerfs to mana regen and there is little to nothing to convince me that at this point being mana-less is anything but an advantage. No matter what, laning against a champion that does not have to worry about losing his ability to fight back is inherently not fun. They can shove the lane when ever they want. They can shove BACK the lane whenever you try to. Never have to worry about missing CS to towers because of being OOM and not able to stop your shove. You want to fight? They can always fight back. They want to fight? You MIGHT be able to fight back.
Please someone tell me what the DISADVANTAGE of not having mana is. And please don't tell me anything about "wasted" stats on items since they don't need mana or regen.

who just needs a few lvls even if she fed lane.
doesn't use any mana but you have to be careful not to go into overheat at the wrong time though