What will happen with creatures that have abilities which trigger upon attack?
I.e. scorpions and quanta generators.
Could be very potent with blessed deathstalkers.
This will also be very interesting if used with SoPa, since SoPa only blocks a creatures first attack each turn.
In the case of adrenaline, this is taken care of by the attack power cap... This card appears to have no such limitation.
Another interesting combo to think on is overdrive.. Adrenaline can ramp up the attack power quickly but once again, is thwarted by its internal attack rate reduction. Here, this is not an issue...
Also, consider This + Overdrive + SoPa.
As a final interesting question: what would happen if you put this onto a voodoo doll?