Ooh. Ouch. Very cheap and very devastating. It seems to me like it needs some nerfing.
The easiest way to take this down a notch is to reduce max life drain to 2 rather than 3. I think that 2 is a reasonable number - quite powerful, but not powerful enough to be overpowered, even with Adrenaline. I'm assuming this also means that the damage of the shard is reduced down to 2.
Maybe the HP can be reduced slightly, too, just to make it easier to get rid of. 4 seems good, so it can be in Elite Otyugh range.
Otherwise, good card. This will make mono-Other an actually viable option