This card is simply For Justice! that costs one less and only works when you switch into hero form. So the relative usefulness of this card depends on how often you switch forms. For ordinary characters with one hero form, you can only use this if you draw it while in alter ego form, rarely more than 50% of the time and usually less, so you want to give this to a character who loves their alter ego form and switches to it constantly.
Hero Response (thwart): After you change form, remove 3 threat from a scheme (4 threat instead if you paid for this card using a resource).
"Maybe this will teach you!" — Captain America