Yeah, even a strong Calvin can't willbreak Bloodstorm enough to be meaningful. I usually try to stun him if possible. I don't use him consistently in my lineup at this time. It really just depends on the opponent. But like Herby suggested, just having a bunch of people who can hit him from a bunch of different angles every turn whittles him down. There is a thread on here that discusses how it seems Bloodstorm's damage increases as his health diminishes. So if you do try to get him with area effect folks, make sure they kill him, not just nickel and dime him, because he's a time bomb.

I think Adamanti is the real game changer, to be honest. At least Bloodstorm only goes nuts on one guy at a time. Once people get Adamanti with a high morale and a critical rune, then stick him in the formation to hit first, well... Rag gets pretty boring. Toss in a high dodge and even when you have first hit... heh. Anyway.