There is 178 different types of alchemist cards.
These 178 cards have 5 different tiers. These tiers are respectively stone tier, iron tier, silver tier, gold tier, philosopher's stone tier.
The levels of the cards are determined by the difficulty and rarity of the card's production.
Only 4 out of 178 cards, the 4 main elements, will be available on a weekly basis. All remaining cards can be crafted by users.