mtg each player discards a card Black Discard Deck then draws that many cards minus one. MTG Cube: Top 10 Discard

There were a few decklists running it in Pro Tour Aetherdrift at the weekend, and it's also been sighted in Modern Challenges, as well as even older formats

With a Fetch Land you suddenly have as many land drops as your heart desires

0079_MTGMB2_WhiteRep: Comet, Stellar Pup 0002_MTGMB2_Playtest: Kozilek, Compleated 0122_MTGMB2_Fut_Reg: Future Sight Attendees of Gen Con got to be the first to experience Mystery Booster 2

Every single pack is also guaranteed to have at least one Multiverse Legend a reprint of an iconic legendary creature with a special showcase frame from its home plane

Selfless Squire Selfless Squire can end up pretty big