Al-Jabr, an Uncommon card

The card carries these facts from its Wikipedia article.

• It was a landmark work in the history of mathematics, with its title being the ultimate etymology of the word "algebra" itself, later borrowed into Medieval Latin as algebrāica.
• Al-Jabr provided an exhaustive account of solving for the positive roots of polynomial equations up to the second degree.
• It was the first text to teach elementary algebra, and the first to teach algebra for its own sake.

Rarity in WikiCards follows a year of Wikipedia page views: the most read articles become Epic and Legendary cards. The Al-Jabr article was read about 75,000 times in a year. ATK comes from the length of the article and DEF from its quality, so this card hits with 61 and blocks with 47: each hit it takes is cut by 19 %.

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 Al-Jabr in the power ranking, all domains together.