Altered: Beyond the Gates contains over 500 playable cards.
Each Booster contains;
1 Hero Card
8 Common Cards
3 Rare cards (There is a 12.5% chance of a unique card replacing a rare card.)
1 Non-Playable Card (Token 20.8%, Mana Convergence 16.7%, A common Foiler 35.1%, a rare Foiler 20.7% or a unique Foiler 6.7%)