Lane partners for Soraka
What Adc's work well with soraka as far as lane synergy?
What Adc's work well with soraka as far as lane synergy?
any adc with mobility or self-peel is a good choice.

All of them have respectable damage outputs of their own and are strong at continuous fights or an all-in after the enemy made a mistake, making Soraka's healing a good fit for longer battles or dealing with poke. Use Soraka's CC to make escape unlikely, and their fighting style really shines.
I like Vayne for it. You can chain one of their CC to the other (Condemn to a wall and drop Equinox so they are silenced and rooted after, or if you land the Equinox root it gives Vayne time to position for a Condemn stun), and Vayne can go in deep enough for Silver Bolt procs because with healing it's not so dangerous.
I just feel like a support like Alistar is a much better pick with vayne.
It's more about who she ISN'T good with I think. She should work fine with anybody who doesn't need a lot of early protection. Vayne and Kog are probably poor choices, Varus might also be since he needs a bit more protection than the average carry due to no mobility.
Anyone but
. Unless you practice. Then you can support her just fine.