How you get it depends on where you are
Friends on the Other Side, Let The Storm Rage On, and Strength of a Raging Fire all fit great and can be used in lots of other decks
Features exclusive foil treatments, alternate art, and extended-art cards
Alandra, Sky Dreamer creates a 2/2 flying Drake token any time you draw your second card each turn, turning those Clue tokens into creatures turn after turn
You'll also know how many face-down conspiracies a player has in the command zone, although you won't know what they are
I know waifu collectors who indiscriminately buy/grade cards with female characters that they find to be cute/attractive/powerful, whether they know the underlying intellectual property or not