In fact, if you were to employ this strategy at the Pro Tour, so long as you did a good job drafting, building your deck, and playing the games, you'd have a perfectly fine chance to do well
Cast Spike on Turn 3 or 4, activate her ability to grab Mind Twist at the end of the opponents turn, and and watch all hope drain from their face as you put them in top-deck mode before the game has really even started
Because lots of these spells are low-cost, Hylda can likely be activated multiple times per turn
Theyd also have to keep the program open long enough to give everyone a chance to do it, which means people could just send them fakes right now and get real cards back in return
Which for four mana, seems reasonable
So when Guilds of Ravnica released and we received the best version of Niv-Mizzet ever printed, I knew I'd have to do a Budget Commander article on him