I don't think "Mark of ysharraajgjash" should be necessarily used in aggro decks, since beast druid is strong as a midrange deck as well. Also, aggro decks don't seem to care that much about draw.
I really like Scaled Nightmare, even though it is simply a win-more card. Dragon decks tend to have strong midgame, so often Scaled Nightmare will be in safety, which means it will be a 4/8 for 6 on your turn, which seems to be at least ok. Also, it has got awesome art. I don't think it will be played by pro players, but I will definitely try it for fun.