Many people will disagree but there is no keystone that works well for singed
Press the attack: Obvious Lethal tempo: Obvious Fleet footwork: Works "OK" if you feel like stopping to auto attack
Execute: Poison fling and then auto attack, works but seems weird Predator: barely works at all. You would think this would be a good idea but its not Dark harvest: running through minions and by them and then you dont recieve the stacks
Summon aery: Works "OK" Arcane comet: Fling tosses them out of the comet (stupid interaction) Phase rush: Hard to proc
Grasp of the undying: Stupid to pick Aftershock: the only good option and its not even that good because you are throwing people away from you Guardian: doesnt work
Unsealed spellbook: a good option however this leaves singed with only one set of runes being either ability power or health Glacial augment: no Kleptomancy: and deffinitly not