Anyways ...
Your Chromatic Orb spell from Unearthed Arcana was a favorite of mine.
We know it was an Autokill spell at 12th level, if the mage could hit with it (and the dreaded and immensely popular elven fighter/mage, always could ...)
We know it was dropped in 2nd Edition AD&D.
I also know that, sadly for me, only one of my characters ever got to use it at 12th level!
Did you have Chromatic Orb as an Autokill spell in mind when you put it in Unearthed Arcana?
Was Chromatic Orb the way you wanted it to be, when it was published?
Do you still think of Chromatic Orb as a noteworthy spell, worthy of being in the Player's Handbook??