Smite Heal support Kassadin.
or Smite Flash support Kassadin
-> use his ult to get in and steal key objectives (blue, dragon, baron) use flash to get out.
-> his ult allows him to ward safely
go kage's pick & philo stone for gp/5.
Then go rylais/rod of ages for survivability
Then go Wota for support
upgrade deathfire grasp.
build = finished
philo, kage, roa, tear, wota
upgrade to dfg, upgrade to Archangels staff
sell philo for nlr & upgrade.
^ high priced support, but given 12 assists + extra gold for assists mastery + gp/5 mastery + gp/5 items + gp/5 runes... you get pretty good gold.
--- have not tried this yet --