Calcium sulfate, an Uncommon card

The card carries these facts from its Wikipedia article.

• It occurs in several hydrated forms, the anhydrous state is a white crystalline solid often found in evaporite deposits.
• Its dihydrate form is the mineral gypsum, which may be dehydrated to produce bassanite, the hemihydrate state.
• Gypsum occurs in nature as crystals or fibrous masses, typically colorless to white, though impurities can impart other hues.

Rarity in WikiCards follows a year of Wikipedia page views: the most read articles become Epic and Legendary cards. The Calcium sulfate article was read about 60,000 times in a year. ATK comes from the length of the article and DEF from its quality, so this card hits with 64 and blocks with 57: each hit it takes is cut by 23 %.

Open packs. Each pack holds five cards drawn from real Wikipedia articles, the rarest last, and the fifth card is always Rare or better. The odds are shown in the game. A free pack arrives every hour and two can wait, and the Coins you win in duels buy more packs.

The cards just above and just below Calcium sulfate in the power ranking, all domains together.