Three ways. Giveaway and reward keys are redeemed in the Have a key panel and open a pack for free. The Pack Pass gives you a free Ignition Pack for every 1,800 credits you spend. And promotions on our Discord hand out keys regularly.
Rarity:
Cards come in seven collectable rarities, plus one that is in a class of its own: Common, Uncommon, Rare, Epic, Legendary, Mythic and Exotic, with the Primordial card above them all. Rarity tells you how strong a card is and how often it appears. Each pack shows its own drop rate for every rarity on the shop page, under Drop rates per card. The rates are per card, so a three card pack gives you three independent chances, and they are always visible before you spend anything.
Where the pack floors matter: Two packs guarantee a minimum on every card: the Whale Pack never contains a Common card, and every card in an Oracle Pack is Rare or better.