Ludwig Boltzmann, a Rare card

The card carries these facts from its Wikipedia article.

• His greatest achievements were the development of statistical mechanics and the statistical explanation of the second law of thermodynamics.
• In 1877, he provided the current definition of entropy, S = k B ln ⁡ Ω, where Ω is the number of microstates whose energy equals the system's energy, interpreted as a measure of the statistical disorder of a system.
• Max Planck named the constant kB the Boltzmann constant.

Rarity in WikiCards follows a year of Wikipedia page views: the most read articles become Epic and Legendary cards. The Ludwig Boltzmann article was read about 200,000 times in a year. ATK comes from the length of the article and DEF from its quality, so this card hits with 76 and blocks with 70: each hit it takes is cut by 28 %.

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 Ludwig Boltzmann in the power ranking, all domains together.