Cards that are printed many times usually have many different art versions, so youre usually looking at a $0.50 to $1.00 difference
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
The only thing that might prevent this particular card from making its way into fire decks is the fact that you have to evolve it to take advantage of its effect
(1) If you control Darkness / Trap A, apply the following effect
Really, any Deck that is comfortable exchanging one monster in their hand for another can get some use out of Small World
Plus, its high-resolution print ensures that the ethereal beauty of Shining Mew remains vibrant and captivating, no matter where you place it