Circle packing, an Uncommon card

The card carries these facts from its Wikipedia article.

• The associated packing density, η, of an arrangement is the proportion of the surface covered by the circles.
• Generalisations can be made to higher dimensions – this is called sphere packing, which usually deals only with identical spheres.
• The branch of mathematics generally known as "circle packing" is concerned with the geometry and combinatorics of packings of arbitrarily-sized circles: these give rise to discrete analogs of conformal mapping, Riemann surfaces and the like.

Rarity in WikiCards follows a year of Wikipedia page views: the most read articles become Epic and Legendary cards. The Circle packing article was read about 35,000 times in a year. ATK comes from the length of the article and DEF from its quality, so this card hits with 56 and blocks with 49: each hit it takes is cut by 20 %.

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 Circle packing in the power ranking, all domains together.