If this card is destroyed by battle, or if this card in its owner's Monster Zone is destroyed by an opponent's card effect: You can target 1 Level 4 or lower Spellcaster monster in your GY
This card is special because it is generic
Prices vary based on grading, condition, centering, rarity, provenance and market demand
The price to pay is that your little goblin will be some other creature's dinner
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