For fun: What if you could have 2 keystones?
Stuff like Glacial + Predator, Fleet + Grasp
What do you think would be meta?
Stuff like Glacial + Predator, Fleet + Grasp
What do you think would be meta?
klepto + grasp 
Aery + Comet
PtA + hail of blades
predator and phase rush
Klepto + Aery

Electrocute + Dark Harvest/Predator (any assassin)
Hail of Blades + Lethal Tempo 
Glacial Augment + Phase Rush (anyone who wants to kite)
[{quoted}](name=Rathar Dashing,realm=NA,application-id=3ErqAdtq,discussion-id=qVUHZcHy,comment-id=0003,timestamp=2018-09-03T22:39:41.933+0000)
Klepto + Aery
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lol thats pretty disgusting now that I think about it
Pta + hail of blades
Fleet + Electrocute Those 2 combinations would probably cause the most uprage
Hail of Blades + Lethal Tempo

Comet + Dark Harvest 
Conqueror + Press the Attack

Phase Rush + Electrocute 
Kleptomancy + Grasp 
Phase Rush + Hail of Blades 
I think PTA and Conqueror would be counterintuitive because PTA doesn't increase true damage, and Conqueror reduces your non-true damage to become true damage, thus decreasing the PTA damage amplify. Well, depends on which gets calculated first anyway.
Comet+Electrocute would be the thing most midlaners grabbed, with Comet+Aery on many others.
I could see PtA+Conqueror on ADCs.
Grasp+Conqueror would work on top laners.
Electro + Dank harvest -> every assassin, ever Aery + grasp -> one of the more opressive toplaners FF+PtA -> adc Predator + Electrocute; -> hecarim Spellbook + Klepto/Comet -> mid/ezreal And Conq + Electro Riven.
Would be busted AF.
Also Conq+lethal tempo Yi would be... disgusting.
Oh & Aery/Electorcute and Aftershock Pantheon; Conq/Aftershock Riven.. ^And similar nieche picks.