There are four (4) levels of scarcity for Sorare cards.
⬛ Unique(1 card per season - this is the only card of its kind in the world)
🟦 Super Rare(10 cards per season)
🟥 Rare(100 cards per season)
🟨 Limited(1000 cards per season)
Common(GRAY) cards have no scarcity (unlimited supply).
Common cards are given to Managers when they join Sorare to learn more about how to play. They are yours to keep but cannot be sold or traded. They can be used to play in certain competitions.