About the "OP", I didn't think about adrenaline. With the high percentage of attacking anything it could be dangerous for your creatures too, and I don't think an upgraded card should be so unfair (even if it's an entropy card.. see pandemonium). Maybe it should cost a bit less and have a 60% of attacking/targeting random targets; a 40% of attacking enemy targets + 20% of attacking yours.^^
No, it's ok the way it is now. The unupped is perfect for enemy creatures in creatureless/gravity decks, and the upped one is good with Adrenaline, but not game-breaking, since you're stopping to attack your opponent, and you don't know if you will kill his/her creatures (it's random, and it could attack a Massive Dragon instead of that hungry Otyugh)
Maybe the costs could be tweaked, dunno how.
The percentage doesn't have to be specified in the card, it's like optional, and I prefer not to tell that (it looks more entropic not to say how often it will attack other creatures).
What would happen if the Confused creature was the only one in the field? Pokemon-ish effect of the creature attacking itself? I agree with the idea of the creature having a chance of damaging itself, as to balance the effect a bit more...
As always, I love your cards Kaos