I got him with my last batch of gem keys. Used up every single Glory and Gem Key now, but hey, never had to plunder my gem stash.
Useage-wise… I tried him a bit and he’s an odd one. His damage is abysmal. Obviously. Even VoO does more damage and most legendaries do, too. His spell is only good for the drain + silence.
So I thought: “Well, he’s a tank”, put him in first place, Ysabelle behind him and watched the armor go up. Problem: He blocks three colors for other troops that way. Also, all armor isn’t helping him against Khorvash and since his third trait is what people will want to use him for, you also don’t want him stunned.
Hence, don’t put him in slots one or two.
Khorvash/Ragnagord (Or Azura/Skullbeard in GW)/CoA/Ysabelle does work wonders, though. If you lose Khorvash and your exploder, you likely have two troops with very high armor and good attack remaining then.
Or just troll people with any combination/amounts of CoA and Ysabelle exclusively.