Magic: The Gathering—Undoubtedly the world's most popular collectible card game (for better or worse).
Cube—A pre-selected collection of cards used for drafting decks.
Draft—A method of card selection where each player selects one card from a pack, then passes the rest to the next player. As the packs circulate, each player assembles a pile of cards from which they can build a deck for playing against others in the same draft pool.
Legacy—The cube contents change over time, and those changes go forward into future draft cycles.
Celebrate the physicality of the cards
Subvert the idea of card value as tied to physical state
Embrace the ephemeral and shifting nature of the meta
Abandon any illusion of control
Enjoy the mythos and storytelling that will inevitably accompany this "y'all remember that one time..."
Have fun
If you'd like more details on the origins of Magpie, I highly recommend reading Jay Dragon's write-up on it: Medium.com—Jay Dragon—The Magpie’s Cube (Magic The Gathering)