Not Updated For Current Season
The masteries shown here are not yet updated for the current season, the guide author needs to set up the new masteries. As such, they will be different than the masteries you see in-game.
this is obviously a Nunu AP build. i tried going for max ap, and tried a bunch of different combinations (tested out on leaguecraft, they apply bonuses from items to build, so it would have added the 1000 mana from archangels. i tried getting rid of zhonyas and throwing in another archangels, but the ap droppd bout 100 or so...but when looking at stats above, make sure you realize its not adding in the items' passive abilities...you need to add 12% of the max mana to AP (bout 450 AP bonus) and you still have the zhonyas 25% AP bonus to calculate in..(dont know if that happens before or after the 12% from archangels)
as for runes, i tried to go magic penetration. but MP would be useless if your facing a disabler team because you wouldn't be able to use your ulti...in which case, get a banshees veil instead of an archangels.
i went flash/heal so u can 'flash' to them and cast your ulti, and follow with an icebolt if necessary...though i dont expect the icebolt to be needed....since his ulti deals 1125 MD plus 2.5 AP (which should max about 960 is 4 archangels and zhonyas). I went with heal just as a safety, mainly because i hate going into teamfights and not having a minion to 'consume'...so, i'd rather be safe then sorry...and if its not for you, you can always save a teammate with it.
i know it didnt apply it to the stats, but this build should have massive health regen...if you go into strength of spirit in the defensive tree...(0.3% of max mana converted to health regen)
if you have any comments/questions..fell free to post.
if you rate either way, please let me know why.
Thanks and good luck!!!