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 a build for AP alistar. one big difference between this and the top ranked build right now, which is here: http://www.mobafire.com/league-of-legends/build/ap-alistar-14581 is that i put more emphasis on mpen. clarity is what fixes your mana problem, along with archangels mp5, not to mention it gives you quite a bit of mana to work with anyways. you get a good amount of AP from this build, and mixed with the mpen, you get great damage output. especially since alistars first two abilities get 100% of that ability power added to them, and your heal gets 40% added, which is awesome because the heal actually becomes useful. exhaust helps with chases, not to mention it blinds, and with the cripple mastery, they get even more of there magic resistance down, not to mention the armor gets reduced as well, which can help in team fights. i hope you guys like this build, and please, PLEASE comment, and rate. if you down vote, please say why, so that we can all learn. also, if you have any suggestions, please put them down there, as i will be checking this often. thanks in advance, GL and HF playing alistar, the minotaur!