TCG Card Shop Simulator has hundreds of cards for you to open from packs which you can then sell back to your customers, but knowing what rarities to look for is crucial to turning a profit.
There are over 1,320 total cards you can find, split between different rarities. It’s hard to know what all the words mean if you’re trying to find expensive cards to sell in your card shop or understand the rarity system ahead of a future update that’ll make the card game playable, so learning ahead of time is crucial to not only maximizing your income, but your ability to play the game against others in the future.