The artwork shows a big old centipede monster devouring some poor persons head
Add in that the deck is based on the beloved Tarkir setting, a plane weve not revisited in a decade, and you have one of the best thematic Commander decks in a generation
While the origin of the idea is somewhat disputed, creative players suggested extending the rule to every card in a Magic deck so that instead of the usual limit of four of a specific card there could be only one
Note: Foils are a special case, since they represent higher levels of rarity vs the non-foil version, but are much more desirable in some formats (Vintage, Legacy, Modern, EDH), than in others (Standard, Casual)
Its generally expected that any future unbans become a Game Changer as theyre unbanned, and future bans are likely to be added to the Game Changer list first