No, you don't

Magic: The Gathering Universes Beyond: Warhammer 40,000 Commander Deck Necron Dynasties Features: 100-card ready-to-play Warhammer 40,000 Commander Deck Necron Dynasties Black Deckcontains 2 legendary traditional foil cards + 98 nonfoil cards Every card features Warhammer-themed artincluding 42 cards that are new to Magic 1 foil-etched Display Commander 10 double-sided tokens, 1 life tracker, and 1 deck box Command a new battlefield in epic multiplayer Magic games set in the world of the popular tabletop miniatures game, Warhammer 40,000 The Necron Dynasties Universes Beyond: Warhammer 40,000 Commander Deck set includes 1 ready-to-play Black deck of 100 Magic: The Gathering cards (2 legendary traditional foil cards, 98 nonfoil cards), 1 foil-etched Display Commander (a thick cardstock copy of the commander card with foil etched into the cards border and art), 10 double-sided tokens, 1 deck box (can hold 100 sleeved cards), 1 life tracker, 1 strategy insert, and 1 reference card

Previews of more cards can be found around the internet between now and November 7, when the full card gallery will be available on the official MTG website
Years later, after a lot of bittersweet sentiments, Mewtwo EX doesn't hold the same unrivaled prestige it once did - but some players still think the card is viable for deckbuilding
No matter if you focus on a single format or try to keep up with everything, knowing the scale of the card pool helps you make smarter decisions
It basically refers to any and all lands that can produce two different types of mana