I will be trying it on Taric for top/jungle. He gets benefit from every keystone and there are still Taric mains who argue which keystone is the best on him. Here is the list of what I believe best to worst on him and why. For those who don't want to take the time to read through everything, Taric can very easily proc and make at least minimal use out of any keystone. Early game, the offensive scaling runes like dark harvest, electrocute, and arcane comet can still be useful but they will fall off late game. Every other keystone is actually pretty good and add something to his kit.
Guardian - as a support role, the extra shielding provides some safety before Taric's ult activates and the speed buff is nice to line up his stun
Press the attack - PTA has no scalings so it is equally effective on everyone depending on how well they can proc it. Taric's passive makes it extremely easy to proc and is good because his lack of offensive stats in a general build are great with its level scaling nature.
Aftershock - Taric scales on armor. What more is there to say?
Grasp of the undying - Grasp is great in a melee vs melee top lane matchup where he can consistently proc it to scale up his health for more late game presence as a tank.
Glacial Augment - Taric struggles sticking to people because he has a self stun when casting his abilities as well as being one of only 4 champions in the entire game with absolutely no mobility. This helps him stay on his target and its synergy with Righteous glory which is already a really good item on him is a bonus.
Fleet Footwork - The added sustain and speed buff is welcome in melee vs ranged matchups in a solo lane. Taric also procs it frequently with his doubled attack speed.
Kleptomancy - Just look up Taric's passive. (not that this matters for the current discussion though)
Unsealed Spellbook - there are other mains who use this and I can see the appeal but I just don't like it on anyone in general.
The rest of the keystones are a little less desirable but still have their use.
Phase Rush - Similar to glacial augment, this makes sticking to people easier and I actually think this is better as a keystone. The problem with it is that the rest of the sorcery choices are very lack luster for him. The same holds true for the other sorcery keystones.
Summon Aery - bonus damage and shielding from his kit while being in melee range for quick reset of it makes this pretty strong for later in the game once he has items. If this were in a different tree, I would consider using it.
Predator - this can make for interesting engages. Taric struggles engaging fights by himself but predator makes it possible.
Conqueror - Taric is great in a sustained fight so stacking it up can be very strong. However, Taric already beats most tanks because of his sustain so conqueror isn't all that appealing to him.
Lethal Tempo - Taric literally doubles his attack speed meaning he can get absurd attack speed with this rune. As a max attack speed test, I had 11.4 attacks per second on him. This isn't all that useful though because of his reliance on casting every 2 autos.
Hail of Blades - Same as lethal tempo
Electrocute - like PTA, Taric can proc it really easily but PTA is just better on him because electrocute relies on offensive stats to scale into late game
Dark harvest - Probably the worst keystone on Taric for similar reasons as electrocute
Arcane comet - My last choice keystone. Taric can reliably proc it, but like dark harvest and electrocute it still relies on offensive stats to scale into late game. The reason this is below dark harvest is because as stated already, there is nothing to be desired from the entire sorcery tree.
is dead in season 10
are champs im going to try it on
maybe? since shes an adc/supp hybrid, can cast on allies, has ap scalings, etc.
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