Sergei Winogradsky, a Common card

The card carries these facts from its Wikipedia article.

• 1 September] 1856 – 24 February 1953), also published under the name Sergius Winogradsky, was a Ukrainian and Russian microbiologist, ecologist and soil scientist who pioneered the cycle-of-life concept.
• Winogradsky discovered the first known form of lithotrophy during his research with Beggiatoa in 1887.
• He reported that Beggiatoa oxidized hydrogen sulfide as an energy source and formed intracellular sulfur droplets.

Rarity in WikiCards follows a year of Wikipedia page views: the most read articles become Epic and Legendary cards. The Sergei Winogradsky article was read about 7,000 times in a year. ATK comes from the length of the article and DEF from its quality, so this card hits with 60 and blocks with 44: each hit it takes is cut by 18 %.

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 Sergei Winogradsky in the power ranking, all domains together.