There is zero reason for such a weak cooldown to still have a cast time.
It is still also bugged to where the rings miss every ally on the way back in, doing nothing to them.
For both Holy and Shadow it either needs to have its bugs fixed and do actual damage and healing or be made instant cast.
It is particularly dumb that Shadow has two major cooldowns with a cast time and one of them is to grant procs that make you open your spell school.
Just give me one season where not playing Oracle isn’t trolling my team.