Spells shown as castable even when they can't be

Say your opponent has a [[Void Winnower]] on the battlefield and you have a [[Jayemdae Tome]] in your hand and the mana to cast it.

The game highlights the Tome as castable. However, when you go to cast It you're told that you can't cast it because of the Winnower.

This isn't a great experience. Would be nicer if the card was not highlighted. And possibly given a hint similar to the hint given to it by Winnower for cards that can no longer block: