Energy Regen Item? Maybe a Mastery?

I was just thinking about the fact that there are energy regeneration runes, which most likely aren't even really used all that often. (I don't really know because I don't have them) but there aren't any items in the game that offer any form of energy regeneration.

Firstly, I definitely do understand that there are only 5 champions who even use Energy as a resource.

So it would certainly be a little extreme to make an item, or multiple items, or even a specific mastery solely for the benefit of less 4% of total champion pool (5/133 = 0.037)

However, could something possibly be added to an item, or simply be a passive that only benefits Energy users for added gold value without being a negative gold value for champions who do not use that item?

I would think that a mastery could be easy to work in. Just take something like Meditation and add some form of energy regeneration stat to it.

And I'm sure I will get some people who will ask me why this is even necessary. Ultimately, it wouldn't be critical, but I just find it a little strange that there simply isn't something already. Energy users are designed well enough that they typically do not have much Energy issues, however, much like mana users getting large mana pools or having lots of mp5, something like this could simply eliminate all issues.

I do acknowledge the fact that something doesn't exist isn't necessarily a good reason for it to be added.

However, I do not think the fact that something doesn't exist is a good reason to not consider it as a possibility.

Sadly, I fully expect to get downvotes for this, but it is really just a topic that was on my mind and I thought I would throw it out there in case anyone wanted to discuss it.

Be gentle.