It has been an evergreen keyword basically ever since, due to how cool its design is
Its a collaboration with game publisher Ravensburger, and is meant to be broadly appealing and approachable, playable by everyone from newbies and kids to hardcore collectors and competitive TCG players
Lucky for us, Casualties of War is even better here, because Jund is slower than RB, and also has enchantments worth to kill (Trail of Crumbs)
Cid and Chocobos from well, all the Final Fantasy games
it then allows you to play any character for free
Each one has a strong questing value that forces opponents to challenge or risk falling behind, and then once challenged and/or banished, their effects activate drawing you cards, forcing opponents to discard or return a character to their hand, and more