Galio should be given spell immunity while ulting

One of the only reasons Galio sucks is because he is so hard countered by so many champions:

Basically if he ults at a slightly wrong time and any of these champions are on the enemy team your ulti is useless. If you don't get off a 5 man ulti then every other hard cc can stop your ultimate easily. This also doesn't even take into account the massive damage you can take from vayne true bolts or stacks from tahm you take during this time, which basically make you dead afterwards.

Also, thematically Galio becomes a statue. He shouldn't be affected by spells. Like a turret.