Luiz Verdascas Mono Black Plague Rats, a classic archetype that is only possible under Alpha 40 Rules
Professional proxy printing in Europe uses black core for the same reason original cards use it, because the result behaves correctly
Spidey is here! 3/2 Illustrated by Roberta Ingranata Standard Legal Alchemy Legal Pioneer Legal Historic Legal Modern Legal Brawl Legal Legacy Legal Comp
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
It was the easiest answer to the question "What happens if I run out of cards?" Remember, barring Charlie's deck, most games back then that came to decking dod so because they ran long
How Do Green Cards Work in MTG