I was calling the Hand of Bim Shalla and Battle Fury THE two power cards from the core set way back when the game first came out, and an expansion later it still seems like that is the case.  The Hand's are just so versitle, cheap and effective.  They should have at least been spell level 2 IMO so that it actually hurt a bit for non-holy mages to put them in their books. 

Another trick against the Forcemaster with swarms is to make use of Charge.  Feral Bobcats are great because they are cheap, effective guards with their Defense die and if they get Pushed they hit really hard when they come back in with their Charge trait.  This can also work with Foxes and Falcons with Rajan's Fury out.  Make that Forcemaster pay for moving your guards out!

I think Jinx is an excellent way to slow the Forcemaster down.  If she can't use her quick action to Push or cast Battle Fury or whatever, she will be much less effective.  An Agony is also good (as it is against any beat-down build). 

As the Priestess, it's worth the 12 mana to Divine Intervention the Forcemaster back to the other side of the board early in the game (like say right when she goes to make her first attack against you).  You'll buy yourself an extra 2-3 turns before you're in danger again, giving you more time to get your defenses up.

Also, if the Forcemage is running a bit high on upkeep (like say Forcefield and Dancing Scimitar going), don't be afraid to Dissolve her Forceblade.  Yes, it's a Cantrip item, but recasting it should be pretty painful for her because it leaves her less mana and actions to Push or Battle Fury...and if she can't recast it for a turn because she has to save, all the better.