It basically turns one of your characters into chimera. Since you're likely to use this on a creature with a great atk/hp, the benefit of adrenaline is going to drop. For that reason, I'd recommend dropping the cost a couple. It having gravity pull is already both a punishment as well as a benefit.
I wouldn't think a shard costing 6, or even 5, with these effects, would be that overpowered. Especially because you could just freeze, reverse time, lobotomize, etc.
I mean, say you put this on a fire dragon. It attacks for a little bit more, ignores a shield, and then dies when your opponent attacks. Would you pay 8 for that? 5 or so seems to be a more appropriate cost.