So can we please address tf
This champ is literal cancer, his stun lasts 2 seconds and generally only has a 4-5 second CD, while every other method on this ability is rarely used....he needs incentive to use different cards for different situations, not just spam gold card and I have come up with few ideas
Option 1: Pick a Cards CD is increased by an additional 4 seconds every time he uses gold Card stacks lasting 30 seconds before he can regain the CD
Option 2: Increase his W's CD to 15 seconds but give CDR based on which card he used (IE blue card would refund 75% of the CD, red 50%, gold wouldn't refund the CD)
Option 3: Inherit Stun timer (similar to Udyr/rek'sai) meaning he can only stun someone once every 10 seconds
Option 4: Increasing mana cost for using the same card, IE first time 100 mana, second 200, third 400, fifth 800
Option 5: Make each card work on a Charge system, meaning if he uses all the charges, he has to wait 30 seconds to get another one (also meaning if he fucks up he wastes the ability)
Option 6: Stun is reduced to .5 seconds if he stuns the same target within 15 seconds
Tell me what you think of these changes
while he has his card up since his pick a card times out and goes on CD if not used unlike 
who can hold her stun for as long as she wants. Also you could build MR to reduce his burst since his burst is basically his W - Auto attack + Q (Usually with 
+ thunderlords) if you had enough MR/HP to survive the combo then you can easily turn around and destroy him since he would have like 6 seconds until he can do anything else but auto.
depending on who you are playing. TF is not even a problem, and even if he was it wouldn't be because of his stun card, but might be how strong he can be with his roaming thanks to his ultimate but even then, he requires some skill to play that champion and he is a high risk, high reward champion...which is much more than I could say about a lot of champions in the game where they are low risk, high reward.