I've been having some success with Support Lissandra.
I've also been tossing around the idea of ADC Kassadin, but unsure how to proceed with it.
ADC Kassadin is impossible, might as well just use a really bad melee champ like Fiora while you're at it. The closest thing you can do is bruiser Kass and with a muramana you can keep it toggled on forever due to your W.
Which is funny because Kassadin was intended to be an import of Anti-Mage, who is a melee agility carry.