Prismatic Spray

[edward]

Cast time is very awkward and not welcome. Standing still as a wizard is never great.

Agreed - glass cannons standing still hurts quite a bit.  Removing casting time & casting duration would be great here.

Remove the cast time and increase the range and then it might have a place as an unpredictable 2 cost that can potentially be better than a fireball or worse than a magic missile.

I think many places we try to err away from RNG as much as possible - and the current prismatic spray is RNG in SO many levels that it's wildly unpredictable.

Without stun the time it takes to complete the spell will still not feel great, either, I think?  Because the damage won't "stun" anyone, so you'll be blasting away at the HoS and they'll just stun you and beat you while you're using it.