I think its a super fun mechanic that takes advantage of abilities that would usually harm you while managing to not be too broken to become unfun
Not only does Carth the Lion help us find our planeswalkers, but it's also a legend, so we can keep multiple Carths around with Mirror Box on the battlefield, which does some absurd things
If you can get the adapt cost down to about 3 or 4 mana reliably, this can turn itself into a very potent threat and remains relevant even when you draw it late
Scene boxes usually contain mechanically unique cards with alternate art treatments that come together to form an iconic vignette
There aren't any color combinations that are especially weak, which lets me breathe a sigh of relief after drafting Rakdos 250 times back in Adventures into the Forgotten Realms
In the face of such an existential threat, the two hunters joined forces with their former enemies, the werewolves, to battle Emrakul's mutated throng