This is my first build, but I've played Taric since beta. I have an excellent understanding of how his skills work and what the best item choices for him are. In this build you will see that the most ridiculous looking build could potentially be the best. So without further talk here is the guide that will change your perspective of Taric the Gem Knight forever.
I chose attack speed quints for an early game boost to add more damage and to make the cool down on his heal faster since his passive is based on auto-attacks. Attack Speed Marks for the same thing. Cooldown on heal and more damage. Armor seals so that you can sustain for longer periods of time and. Ability Power Glyphs for more damage as well and to make your heal stronger.
This mastery tree 21/8/1 provides Taric with good damage but also some health and resistance to make him tough to kill.
You start with mana crystal and 2 potion in order to make Taric last longer in the laning phase. Since Taric has his own heal, he will last forever in lane.
Get the attack speed boots for more damage and decreases the cooldown on heal.
Wits End for the extra magic damage and the attack speed which will help the cooldown on his heal, and general damage. Also, some more magic resist to make Taric more tough.
Once you get Phage nobody will get away from Taric. With the health and added slow effect Taric is going to be extremely hard to kill and almost impossible to get away from.
Zeal for obvious reasons, and then Trinity Force will make Taric the enemies #1 focus so you have to be careful from here on out.
Guinsoo's Rageblade helps Taric's damage for both spells and melee and also decreases cooldown on his heal faster because of Taric's passive.
Rabadon's completes the build pretty much since then you can heal for large amounts and also throw out tons of damage from your spells.
Madreds is just icing on the cake. With Madred's Bloodrazor you can take on anyone. You can kill a tank in just a few seconds or straight up level one of the carries. I haven't tried to go 3v1 yet but 2v1 is pretty easy.
I picked this skill sequence to make taric all around good and not have just one good spell in the beginning. You need to be using all of your spells when you can, whether to heal a teammate or stun an incoming enemy. So keep all of your skills to a relatively close level, but if you have the choice level up either shatter or heal before stun.
I'm sure there are better choices, but for now I really enjoy the extra damage from ignite and the easy get away that flash provides.
In team fight Taric's job is simple. Wait for the tank to engage and let the focus be drawn away from you and then charge in and kill the carry. If you have your whole team with you this shouldn't be a problem. Open up with your stun followed by your ultimate for extra attack damage. Once you've taken the carry down most of the way use shatter to finish him off. Once the carry is dead heal up if needed or heal a teammate and get ready to kill the rest of them.
I've only played a couple of ranked matches with this build but so far so good. I haven't lost a ranked match with Taric yet, and I have carried every game I've played. In laning phase you want to focus on the enemy. Let your AD carry have all the CS, just keep the enemy away from the minions and peck at them. By level 2 or 3 you should be going in for kills. Every time your ignite is up go in and get a kill. Once you've taken down your lane's tower, then start to get some farm, but at the same time keep an eye on where your ad carry is. You are not yet strong enough to kill a bunch of people by yourself so you can use the help from the AD to finalize those kills. By the time you get Trinity Force chances are the enemy has either A) already surrendered; or B) you have won already. So good luck with this build hopefully I get good reviews. Like I said this is my first guide so I apologize for it not being fancy or flashy or extremely in depth. I look forward to your comments and criticism.