It's fashion notebook art, made into a secret lair, that also ties into a cosplay zeitgeist of everyday character clothing options)
It also has great potential to scale up and develop this collaboration further with new worlds (Dragonlance maybe
The fact that it doesnt stop permanents from entering the battlefield from libraries is also huge for certain decks that wouldnt want to run similar cards that hit libraries
that pattern began back in 1995 as a bit of a self-fulfilling prophecy, but as we've been releasing similarly sized sets throughout the year for a while now, we've found there's nothing special about the fall
And maybe add a few Negations to your sideboard for next time!
Rounding out the list are some noncreature spells with strong Legends synergy, mostly ramp like Leyline Immersion and Relic of Legends but also other stuff like board wipe with Urza's Ruinous Blast and mass reanimation with Primevals' Glorious Rebirth