While Subtletys ability is by far the weakest, countering spells for free is always good, even if it will likely just go on top of your foes library
The two abilities arent linked
For Devil Fruit Pattern SPs, watch for the 46 week correction window
Pretty spooky, eh
With flying, trample, and haste, it comes out swinging right away, and when it connects, you draw cards and pile on +1/+1 counters equal to the number of different permanent types in your graveyard, turning every sacrifice into fuel for both power and card advantage
You might be worried about small creatures getting outclassed at the Commander table, but white is the home of small creatures, giving you tools like The Battle of Bywater, Dusk / Dawn, and Assemble the Players to extract the most possible value from your little guys