Sadly, as expected, Jessie and James are not included in any of the artwork in this set
Although Boros Convoke doesn't have any explicit Clues synergy, it's very common for this deck to put Clues to work by turn 2 : You open with an Inspector, then follow on turn 2 with either a Warden (and tap everything to pump it), a Demolition, or in a pinch just crack the Clue to draw an extra card
Alternate art can be found on many staples that feature someone smiling, such as the Lord of the Rings print of Cultivate or the borderless Fallout print of Arcane Signet, allowing you to retain the normal functionality of the deck while gaining additional ramp from Treasures
Thats the power of collectible card games and a reminder that sometimes, you never truly know how a market will evolve.
Of course, this high level of collectability around the games cards, not to mention ever evolving, compelling mechanics, is what has kept Pokemon near the top of the food chain when it comes to being one of the best trading card games in the world