Many of the most valuable Pokmon cards dont immediately look specialunless you know what to look for
I nearly always either draw it too early and have to sit on a dead card for a while, or draw it too late when my graveyard is already past the point of modification
This card also needs to have an Aggron V on a player's bench or in the field for a turn before they can play it
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
Rarity is another critical factorlimited or special edition cards usually boast higher value than common cards
Fate Reforged is right around the corner and LR has got some sweet preview cards this time around