My favorite of these are oldschool commanders that have horrible weaknesses that you can turn into their greatest strengths: one of my very first decks, Karona, False God, is exactly this, where her downside of being passed around the table becomes a huge upside when I toss a Shiny Impetus on her and watch my opponents be forced to murder each other with her
I still think its worth a look in artifact decks, but Id want to be playing cards like Cryptic Coat already, I think
For one, the rarity of these cards makes them a target for counterfeits
Although its not a mana-fixer like Astrolabe is, the card essentially allows you to play more lands for free, as it can guarantee a land drop against Wasteland and Rishadan Port decks, essentially providing you with 22 mana sources in the maindeck, while it can also guarantee to be a non-land spell in other matchups
Two days later and boom