A Paradox Rift booster pack contains 10 cards and 1 basic Energy card, for a total of 11 cards. The set features both Ancient and Future Pokémon, such as Roaring Moon ex and Iron Valiant ex, and includes new Pokémon ex, Trainer cards, and special illustration cards. You can also find various rare and special art cards within the set.  
What's in a pack
Cards: 10 cards per pack, plus 1 Basic Energy card. 
Pokémon: Features new Ancient and Future Pokémon, like Roaring Moon ex, Sandy Shocks ex, Iron Valiant ex, and Iron Hands ex. 
Ancient Pokémon: These have high HP and powerful, high-cost attacks. 
Future Pokémon: These Pokémon are focused on speed and technique with low-cost attacks. 
Additional content
Special cards: 
The set includes over 15 brand-new Pokémon ex, over 20 Trainer cards, and dozens of Pokémon and Trainer cards with special illustrations. 
Rarities: 
Look for special illustration rares, special full art rares, and gold cards. 
Tera Pokémon ex: 
Some Tera Pokémon ex with a crystalline appearance, including a Water-type Garchomp ex, are in the set