Whether it's the unforgettable artwork by Christopher Rush or a promo card celebrating Richard Garfields family, the "lore" adds value beyond the cardboard
There were four warriors-matter cards in Khans of Tarkir (all in WB) and four Gates-matter cards in Guilds of Ravnica (one blue, one Boros, and two artifacts, which makes sense considering its the play-all-the-colors archetype)
Need I say more
But usually, it's because they create a problematic or unfun game environment
A shadowless card is an early version of the base set pokemon trading card game, its right image border has no shadow spreading from it, therefore the name shadowless card
Johto gets its turn, with heavyweights like Lugia-ex, Typhlosion, and Blissey leading the charge