Nearly a week on, what do we think of Ivern?
So far I've played him twice in Normals and all I can say is that he has potential. My biggest issue with him is that you don't get the advantage that you'd think you would. He clears slow. He doesn't clear healthily. The one thing he really has going for him is cheese level 1 buff steals that are completely negated by warding instead of AFKing under tower before minions spawn.
He doesn't scale that well. He doesn't operate well as a Tank, nor does he operate well as a Kite Mage or an Assassin. He has no sustained damage output unless you opt into a Nashor's Tooth build which is cheesy at best. I can see him working well-ish as a Support jungler - but it's not season 2 anymore.
I think he's always going to be a toxic champion with his current kit, and whether he's strong or not is going to depend on whether or not Riot allows him to a viable pick. I fear he's going to get the (Old) Poppy treatment and Riot will prevent him from being viable until he gets slotted for a rework.