Hierarchy, an Uncommon card

The card carries these facts from its Wikipedia article.

• Hierarchy is an important concept in a wide variety of fields, such as architecture, philosophy, design, church, mathematics, computer science, organizational theory, systems theory, systematic biology, and the social sciences.
• A hierarchy can link entities either directly or indirectly, and either vertically or diagonally.
• The only direct links in a hierarchy are to one's immediate superior or subordinate.

Rarity in WikiCards follows a year of Wikipedia page views: the most read articles become Epic and Legendary cards. The Hierarchy article was read about 110,000 times in a year. ATK comes from the length of the article and DEF from its quality, so this card hits with 78 and blocks with 64: each hit it takes is cut by 26 %.

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 Hierarchy in the power ranking, all domains together.