
This card is for Daisy Walker - bookish girl, not good at sports - until you play this card and she becomes "Xena - Warrior Princess".
It turns her poor 2 strength and 2 agility into 5 for the turn! That's monstrous! Tack on Dr. Milan Christopher and you've got 6 strength and 6 agility. It's fast, too, so you've the full 3 actions still to use (plus a tome).
It's main disadvantage is it's brief effect. It only lasts for your investigator phase, so save it until you really need to evade or clobber something.
"I've got a plan" does do something similar - but only for a single Fight, and it costs a lot more. If you don't need to deal that much damage, or you're looking to run away, Mind Over Matter is the card for you.
Rex Murphy, with his lower intellect and higher agility, doesn't gain as much from this card. To be honest, I'm a lot more ambivalent about it in a Rex deck.
And yes, for most other investigators so far, it offers nothing. But still, for me, this is the first card I add to a Daisy deck.
For added giggles, look for any other items that can boost intellect too.