This is because Zvi Mowshowitz (who has broken more engine cards than any other player in Magic history) built a deck around the Bargain that was so degenerate it was preemptively banned in Extended
The biggest reason On the Trail is spiking is that it's a solid inclusion for Ms
Its still a good card though, and it plays well with evasion-granting equipment like Dragoon's Lance
If that permanent was the first spell you cast that turn, the next spell you cast that turn is your second spell
That leave you with only the regular artifacts in the set, and while there are a significant number, Im not sure there are going to be enough in your typical Blue deck to just have this work, since it is a completely useless card without other Artifacts
Compare that to popular Elves like Yeva, Nature's Herald (4983), Timberwatch Elf (1689), Ezuri, Renegade Leader (2019), and Edric, Spymaster of Trest (4362)