User blog comment:The Lost Marbles/Seles, the Shooting Star/@comment-25193301-20140803204008

I think Asterism's effects have now been clarified as much as I can think to. Split the difference between on-hit and on-attack effects for the description, and elaborated on its interaction with on-spell effects like Rylai's or Liandry's.

Also adjusted Supernova's radial ramping. It still expands to 500 range, just differently.