Magic: The Gathering - Bloomburrow Play Booster Box

Play Boosters are 14-card Booster packs that contain eight "slots" (or card options) — six cards are common cards, one is a common that has a 12.5% chance to be replaced with a card from The List, three cards are uncommons, one is a rare or mythic rare, two cards are "wildcards" that can be of any rarity, and one card is a basic land. Play Boosters also include one non-Magic card, with a chance for that to be an art card. Each of the 14 playable cards can be drafted, meaning The List and Special Guests form part of the Limited environment.

~ From MTG Wiki