I've seen several suggestions as to how to nerf the snake (most unreasonable, as killing a card that an entire archetype is built around is as bad as making it too strong).
I have thought about how to change the card, and what the problems are with it. Most people seem to want to lower its amount of Health stolen, but in the matchups where it is really strong, I don't think dropping it to 8 really changes too much.
What I think they should do, is just make its effect go off at end of turn, rather than be a battlecry. This would, in very niche situations, make it stronger than it is now if it lives (very, very unlikely to ever happen). But ultimately, removes the ability to bounce hold a wincon off of it.
This preserves the initial intent of the card, being an instant 20 Health swing, while also removing it's un-interactive aspects.
0
Use Kobold stickyfinger to resolve that if you encountering the immovable object often.