Does adding a +1/+1 counter count as "gaining attack?"
From the FAQ at VsSystem2PCG.AlterVista.org, regarding Mystique's Bitter Fury:

Question


  Does adding counters count as her gaining ATK? What about Trickster God switching her ATK/DEF, would she gain 5 xp as she turns into a 6/1?


Answer


  Yes and Yes.