An ability idea

Okay, so I have this idea for an ability. What if a champion could remember the first ability he saw used and then either reactivate the ability to copy it, doing the ability itself or block the next time the ability is used on it. In either case, the ability is put on cooldown equal to that of the ability used on it.

Example, lets say Darius uses his Q, and this champion sees Darius use it. Well, if Darius tries hitting the champion with his Q again it will instead be blocked, putting the new champion's ability on a cooldown equal to Darius's Q. Or the new champion could reactivate and copy Darius's Q, and then put the ability on cooldown equal to that of Darius's Q once again.

Also, he only stores the first ability he saw used after it gets learned or goes off of cooldown, so if Darius Q's then E's once this ability is learned, the new Champion will still remember the Q as that was what it saw first.