Alistar

Support

Can’t Milk Those

Teamfight frontline and creative ganks/roams with Hexflash.

Resolve

Durability and crowd control

Aftershock

After immobilizing an enemy champion gain defenses and later deal a burst of adaptive damage around you.
Demolish

Charge up a powerful attack against a tower while near it.
Bone Plating

After taking damage from an enemy champion, the next 3 spells or attacks you receive deal less damage.
Unflinching

Increase your Tenacity and Slow Resistance for each summoner spell on cooldown. Immediately after casting a Summoner Spell, gain a larger burst of Tenacity and Slow Resistance for a moderate duration.

Inspiration

Creative tools and rule bending

Hextech Flashtraption

While Flash is on cooldown it is replaced by Hexflash.

Hexflash: Channel, then blink to a new location.
Minion Dematerializer

Start the game with 6 Minion Dematerializers. Killing minions with the item gives permanent bonus damage vs. that minion type.

Offense

+1-10% CDR
Flex

+6 Armor
Defense

+15-90 Health

WhyAftershock

Aftershock, like Courage of the Colossus, is a great keystone choice for Alister as it gives you defenses upon engaging and a bit of extra damage thanks to the explosion.

WhyDemolish

Demolish on Alistar allows you to snowball early kills/picks into a team-wide gold advantage from early towers.

WhyBone Plating

Bone Plating allows you to negate a lot of initial incoming burst damage when diving into the enemy team for an engage combo with [W]->[Q]

WhyUnflinching

Unflinching allows you to stick to a target while your [E] charges after Flashing onto them, helping you proc the extra stun for the kill and follow up with additional CC.

WhyHextech Flashtraption

Hexflash in an incredibly threatening ability on Alistar if you learn how and when to use it effectively. If you're able to control a lane brush with a Control Ward you present a ton of lane pressure being able to Flash out at any moment.

Hexflash is also great for roams to the mid lane where you're able to flash in the lane from either the Raptors or behind the mid walls.

WhyMinion Dematerializer

Minion Dematerializer can be great on melee supports for reliably proccing Targon's from range as well as helping you keep the lane push for importabt roams.