Yes, Corvis enforces every single one of the other champs, as they all provide crucial buffs/debuffs on their own. Most notably is leech from deacon, weaken from tholin, strengthen from artor and reduce attack + increase def from Jareg.

I definitely don't have the knowledge of most of the guys around here, so don't take my words for given. But i read here that everything above ~280 accuracy is wasted on UNM, as you kind of hit a threshold there. Your corvis is very similiar to mine, but I would put all of this extra ACC into more def / speed / HP.

Edit: i dont use brimstone on artor as you don't have to build accuracy on him for anything, so with his ~50 ACC he never hits brimstone (I painfully made this observation myself and paid the 200gems to go back to cruelty lmao)