Time Walk is simply too strong
In many ways, these two cards do that better
Nice Jitte, guess I'll feed it some 1/1 tokens and completely negate your 4 drop with my still useful 1 drop
Meanwhile, Izzet Charm can still counter that planeswalker (admittedly in a much less efficient way since it costs twice as much as Spell Pierce does), but it can also kill the Dark Confidant and, when the other modes are dead, potentially improve your hand by looting away some extra lands, Faithless Lootingstyle
If you do, search your library for a Doctor card, put it onto the battlefield, then shuffle
The Pokmon Video Game Championship has similar requirements, whereas other games such as Pokmon GO and Pokmon Unite have their own unique qualification systems