Your weapons are cards.

[ She flicks her tail, speeds up a little to perch at the top of one of the banisters. ]

Even if you weaved spells over a card, it'd be something more flashy than powerful. Cards are useful for magic, but... not combat magic, so much.

You're bigger than me, so more physical strength. But that makes you slower in a fight. And there's more of you to hit.

Plus, you're human.