
I think that Gambit is prime candidate for new Firepower build because of this card. he can use his tokens to upgrade firepower to 6+ dmg values and on top of that has a cheap weapon without restricted to exhaust for it (its basic usage is almost worthless anyway, no big deal) - it doesnt block Hand Cannon or Jarnbjorn. throw in Warrior Skill and Aggressive Energy and you have 24 dmg for 1... now thats value.
additional synergy cards for this build include One by One and Melee as they do similar things after you exhaust your weapons and want more burst in one turn.