Aurelion Sol needs buff / Changes.
Needs Buffs
Q is great, but the only two real skills she gets is Q +R, W constantly takes mana, so you have to build mana regen, or + Mana Items which is one weakness for constantly using W, not to mention actually hitting a target constantly or enough vs all in champions feels too small.
Also have to build Move speed because of her Q just to make it grow in size to make it really big possibly do the entire map.
Her cool-downs are way too long on Q, and Ult considering she lacks a good E skill that totally really doesn't do anything for a fight.
Now in the LCS, and Pre-Mades might be a different story but needs changes for sure.
While I can assure you about my masculinity I also want you to realize that I'm still warming up in this.. Rift.. as you call that. Also You probably have never seen what my W+R can do after the enemy team has attempted an engage and burnt their mobility/escape tools.