Cards that are printed many times usually have many different art versions, so youre usually looking at a $0.50 to $1.00 difference
Outside of jank shenanigans, though, shock lands have subtypes just like the original duals which are great to pair with fetch or check lands
Part of a cycle that features the almost-as-broken Gaea's Cradle and somehow the hilariously unbroken Shivan Gorge, Tolarian Academy taps to make a mana for each artifact you control, which led to decks that would dump their entire hand of cheap artifacts, make a ton of mana by tapping and maybe untapping Tolarian Academy, and then use big card-draw spells like Windfall and Stroke of Genius to refill before eventually milling the opponent out with Stroke of Genius, potentially all on Turn 1
(1) If you control Darkness / Trap A, apply the following effect
It is in that middle ground where you want to play a comparable power six drop that you have significantly more chance of just casting or you want to play something utterly obscene that costs eight or more mana instead
8 Meloetta ex (Special Illustration Rare) $54.82 A Mellow Start Meloetta makes a statement with one of this Pokemon's most visually detailed cards ever, at a relatively good price considering how much some of the other best Black Bolt cards command