Cathar Commando is absolutely wild for a common in a Standard set
Since then, Lurrus of the Dream-Den has been banned, which has changed quite a lot for Modern, but this hasnt prevented Mishras Bauble from being successfully played in numerous tier 1 decks of the format
Fourth Place Veil of Summer Andrea Piemonti Banned in multiple formats, Veil of Summer is still here in Modern
Star of Extinction and Day of Judgment are busts on value, though these exact printings might fetch a higher price
Moving forward, its all about being proactive against what you expect to appear at a tournament
Naturally, the other problem with Magic is that, naturally, its a collectible card game, so the players who can afford to burn more money on it also tend to have better cards, especially if theyre doing things like picking up entire unopened cases