I was playing the CoC, and my friend's wizard drew Rockfall. He had Mass Frenzy and Righteous Frenzy, but the rockfall still did 6 damage to each enemy, rather than 8. I don't really have the log, as I was in a rush to finish the battle.
Interesting. Looking through Cards.csv, I see that Rockfall has a damageType listed after the amount, and other cards like Fireball and Firestorm do not. The only other attack card with a damageType listed for the immediate damage is Cave In, so that probably won't get boosted either.
*cough* So we already have the means to create unbuffable Burst damage? How I wish this error happened for all bursts!
Fixed this for next live build. And by this I mean Rockfall and Cave In. The 'bug' here may prove useful as a feature in the future, who knows!