Marvel Super Heroes Play Boosters contain 14 cards designed for both Draft and Set opening, featuring 1–5 Rares/Mythics, 3–6 Uncommons, 5–8 Commons, and 1 Land. 
 
Key Play Booster Contents Breakdown:
1–5 Rare or Higher: Roughly 33% of packs have 2, 6% have 3, and <1% have 4-5.
1 Traditional Foil: Any rarity, including a <1% chance for a Foil Borderless Mythic.
3–6 Uncommons & 5–8 Commons: The bulk of the pack.
1 Land: Traditional Foil Land replaces this in 20% of packs.
1 Token/Ad Card: 14th card.