The champ seems to be strong, but his buff strip is single target only. Not much difference to Astralith in regards of killing champs with stoneskin. The only constellation where the new champ is better would be a situation where the stoneskin champ is not the fastest on the enemy team, and a bomb from Astralith would be reoved by Mithrala/Pythion before it can explode. In other words, he is counter to stoneskin UDK.
There's a key differene to the two. Astralith's bomb can get through Stoneskin, yes, but it does nothing against block debuffs.
Once this guy starts entering the meta, I fully expect the pendulum to start swinging back towards speed/CC being the new thing.