In everybodys favorite casual format, where youre allowed to cast do-nothing 6-mana enchantments like Impostor Syndrome, there are plenty of ways to exploit this card, including legends-matter decks, blink decks, or decks that thrive on saboteur abilities
I think theyre all clueless
The fact that a second Hyper Rare places so high in the set, ousting so many other fantastic designs and Special Illustrations, is testament to the pull factor of Cynthia and Garchomp
The ability to tap for colored mana is an upgrade on its usual colorless production
Its worth remembering that Surveil 2 is always a more-than-linear power jump from Surveil 1, since youre able to leave a potentially critical spell on top while continuing to slide cards out from under it into your graveyard
Release weekend saw immediate buyouts of copies listed under market price, creating an artificial floor early on