This is beautiful.
X-23 has several ways to enhance her ATK stat, so allowing her to plow those bonuses into a Thwart is amazing. Particularly since she can easily ready and perform a basic action a second time.
My only disappointment is that it only works for a single Thwart action. But if they hadn't imposed that restriction, she could easily remove all of the threat from the table in a single round. (See Honey Badger)
Still a wonderful card given the bonuses her other upgrades confer.