The other end of the spectrum is workhorse
Leylines are a special group of cards that represent invisible magical highways crisscrossing the world, shaping how mana flows, gathers, and occasionally causes everyone problems
It featured in some of the earliest decks in the game, it was a pivotal piece of the Sligh deck which essentially acted as the foundation of the mono red aggro archetype, and its presence has been significant in Modern from the first day of the format as it has featured in many of the formats best decks from Zoo to Splinter Twin to Jund
Etrata, Deadly Fugitive + Roshan, Hidden Magister Some assassins play into the face-down creature space, which ties nicely into the whole anonymous and evasive thing
I also love that it says spell, so this includes all your nonland cards
These are the rarest cards in Disney Lorcana