If nobody adds their copies to the market to race to the bottom and the market price remains at the old number for an extended period of time, then its pretty clear that the single person who bought out the cards and relisted them for higher wont be making any money, at least on TCGplayer
Since this can be done at instant speed, once this emblem is out there's no need to attack anymore
Could it win you games from your Mystery Booster 2 draft, absolutely, but including it in other decks is more of a flavor choice
So at Pro Tour - Chicago last month, Aaron assigned me the task of ranking the best white spells of all time
Read ahead, at your own peril
If you build a deck for high power and sit at battlecruiser precons and snacks, the deck will be technically functional and socially disastrous