Calcium sulfide, a Common card

The card carries these facts from its Wikipedia article.

• This white material crystallizes in cubes like rock salt.
• CaS has been studied as a component in a process that would recycle gypsum, a product of flue-gas desulfurization.
• Like many salts containing sulfide ions, CaS typically has an odour of H2S, which results from small amount of this gas formed by hydrolysis of the salt.

Rarity in WikiCards follows a year of Wikipedia page views: the most read articles become Epic and Legendary cards. The Calcium sulfide article was read about 10,000 times in a year. ATK comes from the length of the article and DEF from its quality, so this card hits with 51 and blocks with 26: each hit it takes is cut by 10 %.

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 sulfide in the power ranking, all domains together.