Crazy good when you have several options for Practiced skills.
A Roland Banks might try to hit Vicious Blow / Deduction / Leadership.
A Finn Edwards might pull out a Three Aces to set up the combo (also Momentum and Deduction obviously).
Overpower and Perception are in the pool of hittable skills, good complements to Deduction and Vicious Blow respectively to make sure you do actually hit something. Mandy Thompson can pull and commit two skills simultaneously!
Getting a second hit from a whopper skill card like Deduction or Vicious Blow is great value all on its own. Also as a search mechanic you might manage to find some research goodies while you're at it.
The problem is that this is'nt just one card, it's 10! You need to make some olypmics level informed decisions about the deck youre building with this in (and really, Practice Makes Perfect is'nt the key card here, it'll all those other ones you're trying to get repeat uses from), but the end result is pretty cool.