Today, I focus on cards that help a typal deck in a generic way, like Cavern of Souls and Coat of Arms, and not on a specific creature type like elves or goblins
The only downside Academy has is that it cant produce any mana if you have no artifacts in play, but it isnt very difficult in any format to build a deck that can virtually always get artifacts into play in the early game, so the downside almost never comes up
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While in recent years Shiny Pokmon have become a bit more common (especially in Shining Fates), at the time they were a massive deal, which is why Rayquaza Star is worth almost $1000
Either way, tying up a Commander for a few turns, unable to be recast, is sometimes all you need