@Smmenen Gitaxian Probe is really not comparable to Street Wraith, or Preordain to do this shows a massive misunderstanding of why the card sees so much play and why its so good. Yes, it cycles and for 0 mana, but that is pretty much where the comparisons ends.
Telepathy costs U, and -1 card. Yet in my early days of playing magic, it was a damn good card. The perfect knowledge for a beginner is INSANE. Yes, I understand your point that as you get more experience perfect knowledge becomes less important, but it is still valuable. With a lot of experience, you can make a good estimation of what's in your opponents hand, maybe even up to 90% or so, but that's still less than 100%. The cost of Gitaxian probe to fill in that extra 10%? Just 2 life. No cards, no mana. When you talk about cards like Cabal Therapy that information becomes even more valuable. As a diehard dredge player, I feel I can blind name game changing cards something around 50+%, I'd consider that to be pretty good. But if they don't have any game changing cards in their hand, its 0%. With probe though? That's 100%. Every time. You get a similar improvement to every tutor, every Preordain/ponder/brainstorm, every fetchland that you use after you probe. You can go from some % less than 100, to 100% that is the right play. I don't care how good you are, you are not always going to 100% make the right play based on your opponents hand without actually knowing your opponents hand! This information is the entire reason the card is good. Neither Street Wraith, nor preodain do that.
Compared to Street Wraith:
Its also a blue card, which means the card can be pitched to Force of Will. Its also an instant/sorcery meaning that you can flash it back on a resolved Yawg Will, or with a Jace/Snapcaster, and that it also triggers your Mentor and adds to your storm. Unlike Street Wraith, its hit by spheres, it can be countered and can't be eaten by an Ichorid.
Compared to Preordain:
It costs 0 mana. Meaning you can play it turn 1 before you cast any of your other spells, and even before you choose to play your land. Meaning you can play it in a non-blue deck altogether. Meaning that it has 0 tempo less. Unlike Preodain, it doesn't really improve the quality of your draws.
This all said, restricting the card is absurd. Its a good card, even a great card, but it does almost nothing in the scheme of balancing decks. Any deck without Thorn effects can, and honestly probably should play it if they can find room in their deck.