OK, after some experimenting this is what I have. All this is done in the trainer using the More Power button, I don't think that has any effect on anything, just putting the variables out there. So far I have only tested using unupped cards.
I tried a few other flying weapons but none of them seemed to have any problem. It seems to be just Discord. jmizzle is right that it cycles through the attacks. First it hits for 4, then 3, then 2. It has something to do with Discord's ability because a lobotomized Discord attacks normally - 4,3,2 all in one turn. Curiously, it remembers which attack it was on after being lobotomized. If, say, last turn it attacked for 4 and this turn you lobotomize it, it will attack for only 3,2 not the full 4,3,2 this turn. After that it will be back to normal, i.e. expected non-buggy behavior with adrenaline.