this is my first guide and I'm not so good at english. alistar is my favorite champion.
this built is how i play alistar so plz whrite some coments if you think i should play him another way.
i haven't work on this built so much but the items is good i think. (i play with those items)

hp runes. do i have because he can take more damage
magic pen runes. do i have because that makes him to damage more.
mana reg runes. di i have because then i can use his abilities more.

i play with flash and clarity.
if you think that clarity is wrong so let me know.
flash is the best spell and it fits alistar.

first i start with doran's ring because i want that sweet mana reg and hp.
then i buy boots of speed and a sapphire crystal.
then i buy sheen and Ionian boots of lucididy and maybe a ruby crystal if i have enogh money.
then i buy phage and try to build frozen mallet.
after this you can choose to buy frozen hart or thornmail or force of nature or abyssal scepter
decide what you whant to buy. if they have a feeded trynd or yi or ashe buy thornmail.
if they have veigar or karthus or some strong ap champion so buy force of nature.
if they have ap champs but your team is probably winning and you want to damage litle more buy abyssal scepter.
you can buy rylai's crystal scepterin late game.

this is my favorite part of alistar he have so many great combos that makes your teammates to get kills.
PULVERIZE HEADBUTT HEAL first you run into them or flash and pulverize then you goes on the other side of them and headbutt you can knock them into an tower or just back to your teammates. then you heal with triumphant roar and got that boost from sheen and smash them with your basic attack.

headbutt pulverise heal it's the sae principe but when you headbutt you must headbutt the enemy into a wall or back the way that he would not run to because if you just knock him forward you will not going to get a pulverize on him and he will run away.

you can use your headbutt like a flash and jump to nearby minions or champs.

unbrakeble will pulverize headbutt heal start your ulti and pulverize the enemy in the tower range go on the other side of him and headbutt so your
team mates can attack him and you are taking the damage :)

i hope that you've enjojed my built and i hope that you also will play like me.
plz whrite coments and say what you liked and not liked about this built.