Hm ...
I think the central idea of this card is quite good but its HPs are too high. If you think about it, in many ways this card is like buffing your own shield by 1, and it is a cumulative effect. That's extremely powerful by game standards. And while it might seem that a 2-HP creature is easy to remove from the playing field, that's only true relatively speaking -- at the very least it's going to cost the opponent a skill usage, but more likely a valuable creature control card. And presumably, if this creature were frozen (for example) its negative buff would still be in effect.
I would change the card to be a low-cost creature that has 1|2 and 0|2 for its stats. Other than that I like the card a lot.
One curiosity: If this card is targeted with Rewind, whose deck does it enter? I think it would be cool if it entered the opponent's deck ... that way if he had Darkness Quanta he could play it against you, making a nifty (although very hard to orchestrate) counter.