Often, Talrand decks win off some combo, like creating infinite loops of casting the same few spells over and over again until you win the game through either an overwhelming board state or by locking your opponents out of the game
The strength of Black Market Connections comes from its utility
You've spent the grading fee and waited months for the same result
However, the Therapists ability is repeatable, so being able to name a card your opponent actually has isnt that difficult
Goldin, the company that held the auction, claims that only 4 Trophy Pikachu Silvers have ever been graded , and of those four, this one was the only copy to hit a PSA 10 grade
This is very different from, lets say, custom alter cards, as the art on those is the property of the people who make them, and also, you know you arent buying a real card. Play it safe if you print the back of an MTG card and put a custom-altered version on the front, and restrict its use to kitchen table rules