Griselbrand is cool, but Jin does so much work in the combo matchups where Big Griz doesn't. As others have mentioned, you really win the game when they have to go off their next turn or die, and you've already drawn 7 to hopefully delay that.

I'll give Griz a shot, but I don't see him taking any spots from my current reanimation team. I like him in Dredge though!