I think this card need a change because as it is now(and so before) it is UP and rarely used because it's lack of synergies, especially in its own element, wich is sad.
If i have to give a suggestion i'll go with more HP reduced(maybe for both unup and up, but with an increase in upped one), or a total change, wich i propose to be something like "opponent can't heal itself for 2 turns", to give it at least more concrete synergies (even if not that much in its element) and a dark manipulation mechanic thematic. That said i'm not the best at improving ingame cards, my first concern is about as it is now.