Not only does your graveyard need to be pretty full, but you also have to be okay with permanently losing all of those cards you exiled
it was the accelerant
From a core functionality standpoint, it seems that Pokemon TCG Live will work mostly like Pokemon TCG Online does already, though with updated visuals and animated, 3D avatars to replace that replace the static avatars from PTCGO
Often it has a lot to do with the use in the gameplay and how effective they are in combat, however in some cases it can also come down to how desirable the cards look
Artifacts originally had special typings (Mono, Poly, and Continuous) which would mostly be rendered moot by the invention of a tap symbol
Wizards removed cards under the banner of eliminating racist imagery in the game, but in addition to banning cards such as Invoke Prejudice, the company also banned Jihad, a move which as Bhatt explains, conflates the religion of Islam with a race or ethnicity, ultimately alienating Arab players when the intent was to foster inclusivity