Quote from xaltair »Yeah, she can't be countered and the emblems stack. In standard she can come down in turn 4 in an aggressive gruul deck and start making emblems and chipping at the life total. Death will come shortly in a couple of turns.
You won't have to wait to win with the emblems, just a couple of turns is enough. It's damage that can't be interacted with, and having it as a plus activation is nuts.
Combined that her first activation of her +2 brings her to 8 loyalty means she is going to be annoying to bring down with combat damage, possibly giving you more life in the process and buying you enough time that the emblem might do all the work needed. Combined with what is close to Slagstorm as a minus to protect you from aggro means she is going to put in some work, to say the least.