Best Magic System (Nominations Needed)

Edit: Nominations are closed. The reader generated poll is here: 

http://www.chrisbrecheen.com/2016/01/best-magic-system-semifinal-1.html

What is the best system of magic in a book or book series?  

While I give you one more day to get the last votes in on our Best Dystopia Poll (on the lower left side), let's get started on our January poll before it gets too late in the month.

Magic systems vary greatly from authorial hand waving (it's magic....whatever), complicated systems of exactly what magic can do and how, all the way to every single person having their own unique magical talent with severe limitations.

Which one is the best? "Best" might mean most interesting, most well thought out, most well explained, most imagination grabbing. Or perhaps you are more particular to described in exquisite living detail or just a funny cavalcade of "miscasts" when someone uses magic who can't handle it. Use whatever criteria you decide makes for the best magic system.

The Rules

1- As always, I leave the niggling to your best judgement because I'd rather be inclusive. If you feel like time travelers from the future using quantum fields to basically do magic, I'm not going to argue that it doesn't count. (Though you might need to "show your work" to get anyone to second your nomination.)

2- Since magic systems are typically part of the setting of a book, the nominations can be for a single book, a series, or several series that all use the same magic system.

3- You may nominate two (2) works with magic systems you like. Remember that I am a terrifying megalomaniac who hates free will and all things that smell like liberty. To encourage reading and reading comprehension I will NOT take any magic systems beyond the second that you suggest. (I will consider a long list to be "seconds" if someone else nominates them as well.)

3- You may (and should) second as many nominations of others as you wish. That is the only way they'll be making it to the final poll

4- Please put your nominations here. I will take magic systems nominated as comments to this post on other social media (Facebook or G+ for example); however, they may not get the seconds you need to go onto our poll because no one will see them. (Seriously, Deloris Umbridge got a nomination on our best villain poll, but she received no seconds because she was nominated on Facebook instead of here. And then everyone got sad that she wasn't on the polls.)

5- You are nominating WRITTEN MAGIC SYSTEMS, not their movie portrayals. CGI epic Battle of Hogwart's fights might be very pretty, but if you find the Harry Potter magic system in the books to be a little stifling and inconsistent with what can be done with or without a wand in hand, you shouldn't nominate that world.