I don’t use him but when vs him I like to deploy something with a every turn alt attack. Eg bezerk attack. I’d deploy him if an opponent has all one damage type out. Mostly.
Yeah i think i only really use him vs amp BGs (psych/electric) When theres a lot of magic or physical out i'll drop Moog. Just started running Moog again he's a looottt of fun
In my experience Gekaal's value is mostly in the threat he presents to an opponent getting too close, rather than what he can actually do when that happens - sort of like having a nuke, but not using it.