Charm looks pretty awesome. The fact that it activates on every buy while also potentially providing Buys makes it a mini-Haggler that is weaker when greening but has the same crazy 3-pile potential, but is easier to fit into a deck.
Overall, it seems to me that Empires' mix of cards is shifting even more towards having fewer terminals and more good alt-treasure payload. What is left as terminal is mostly attacks and terminal draw.
I haven't run any maths, though. It's just a feeling.
Also, nobody has mentioned it yet, so I'll point out the obvious: Forum+cost reduction is the insta-pile card that we've all been waiting for.