We had designed an enchantment set, but the set was part of a series of stories from the Artifacts Cycle, had a set symbol of a gear, and focused on the artificer Urza
A lot of players may think that Tyrranax Rex will be the infect game-winner, but I think the Contaminator here will take that crown
But the last 15 years haven't been especially kind to Jace, with its downfall being sealed when it was finally unbanned in Modern only to see essentially zero play in the format
Just look at it from the publisher, Wizards of the Coast, point of view they want to attract fans from other franchises (hence the crossover), and still need to make the set fun, exciting, and balanced right from turn one
It simply makes the game hurt