Yay, fractal + damsels + this + sofrees and we have unstoppable killing machine ^^ Thus, I don't suggest buffing attack and I even wonder if it is not OP in current state.
Ah fractal... killer of many a mass buff idea.
Buffing damage isn't the only issue. Consider the effect in a sparktal deck (or especially the upped Ball lightening version)
In the upped version you could get 8 6|8 creatures for 12
and 3 cards.
Add to this the fact that you could throw in sky blitz on top... its not quite an OTK... just barely, but its about the very next best thing.
If you have even 1 SoFr in play at the time it probably will OTK actually.
So ~4 card OTK for 21
... this would be a little OP compared with the currently available OTK combos.
This would probably make RoL-Hope OP as well. Particularly if you add in SoFr (for shield bypass). It can get you up to eight 2|8 rays of light in 1 turn.