The pinball machine inside holds a secret switch that activates an elevator down to a hidden room where Avalanche holds their secret meetings
// Take a Trip to
Cauldron Familiar is also particularly awesome here, since if it dies (say, as a chump blocker), you can return it to the battlefield by sacrificing a Food, and if you do it on your turn with Gyome on the battlefield, Gyome will replace the Food on your end step
Oblivion Ring and Banishing Light illustrate this very well: like Armadillo Cloak and Unflinching Courage, most of the time O-Ring and the Light are basically the same, but with some clever manipulation of triggers on the stack, Oblivion Ring can be used to permanently remove something from the game
Mythic rares are the splashiest cards in any given set, the ones that generate the most buzz and that usually bring something new to the table, or that enable a special deck built around them