User blog comment:StrategicMagic/Carry by Proxy - Why (Some) Assasins Don't Fall Off Late/@comment-83.196.94.64-20121207005751

gj assassin you popped the GA on someone ,

and now the orianna/ karthus/ cassiopeia is going to kill your whole team with AoEs , but sure gj you popped a GA

the issue is you have no AoE on leblanc

true on an assassin you can punish mistakes like someone going alone to do a buff or to push a lane, really easily and quickly get away before his mates  get to you (which is what you should try to do,   late game i think leblanc's job is to assassinate people before a teamfight)

but a mage with pure AoE spells will be MUCH stronger in a teamfight