I would decrease the cost of Ghost to 2
because you're going to sacrifice it anyways... You don't want to keep it to deal damage and therefore have higher hp... If you do this to make it be out of Otyugh's range, remember Elite Otyugh. There's no point in this and I recommend lowering the cost instead of increasing the hp. Otherwise, it's an awesome idea.
Also, I think it should drain the other player's quanta since it's still his creature.