Aery has fun optimizations you can use to proc. it more and also offers a better lane phase. Comet is basically limited to just hard CC champions like Malzahar. I think it needs a small buff and that buff should be to allow it to proc. spell effects like Liandrys or Rylai's. This probably sounds stronger than it actually is.
this would also synergize better with DoT users who typically get Rylai's/Liandry's
Karma is very good with comet
Comet is pretty damn good as it is, it doesn't need buffing. It deals considerable burst if you don't move out of the way. Do not by any means discount how powerful forcing your enemies to move might be. Anything you do to pressure them out of the position they are in is a massive advantage to you and your team.
