The damage is equal to twice your int bonus, and could actually pair well with hand of the apprentice - except for the fact it competes with Quicken Spell for the swift action.
Actually, since it only specifies melee or ranged attack, while not saying it has to be an unarmed strike or a weapon attack, it could apply to touch attacks, as well. I suspect that interpretation requires some form of GM approval, however.
It could actually be good on a Wizard, who is typically only making a single attack a round. The feat investments, however, aren't the greatest.
I had it on a PFS character and I found it to be nearly useless. The main issue is that it requires 2 swift actions before it even gets started. You have to activate the style and identify the critter, both of which are swift actions. Swift actions are funny beasts since you can't swap other actions to be them (except immediate actions) so you can only do one per round. So unless you have a GM who allows you to always be in a combat style even while not in combat, you can only get the bonus damage on the third round, and in my experience it's a rare combat which goes that long.
Apologies for the lack of posting guys - had a medical emergency last Thursday, and I am still recovering from it... Trying to catch up as best as possible.
I will also grab this opportunity to let you know I will (hopefully) be travelling from the 18th to the 27th to visit family over the Christmas holidays, so posting will definitely be spotty.