next week is half stam and clash of clashes I would say, but let's see and wait.

Pick the one you can farm consistently and need (ie Doffy, MC would be good also, Heracles if you have SW Ace), as far Iva you can always use natural stam since his special is no use (you probably want to socket him only)

I personally will gem for Doffy, Mihawk (if I havent max him yet), and Chopper. The rest just use natural stamina, especially Heracles , I don't need him at the moment

One day I'll pull INT Ivankov and her raid will make more sense to me...