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That being said, I think the reasons for a card being banned can be broken down into two main categories: A card is too powerful on its own and almost every deck has to have it to be good

Thats because this card happens to feature a clue that pointed to Ursula way back then

There was Accelerated Blue and the German Dragon in Standard, Suicide Brown and Iron Giant in Extended, good old Yawgmoth's Bargain in just about everything that allowed it, and then a lot of descendants of those initial Tinker decks that continued to get refined and grow in power until they took over Extended in New Orleans

you had to go through an open door, which meant the Rooms had to be next to one another, either adjacent vertically on the same card, or horizontal to a card next to it