Manganese dioxide, an Uncommon card

The card carries these facts from its Wikipedia article.

• This blackish or brown solid occurs naturally as the mineral pyrolusite, which is the main ore of manganese and a component of manganese nodules.
• The principal use for MnO2 is for dry-cell batteries, such as the alkaline battery and the zinc–carbon battery, although it is also used for other battery chemistries such as aqueous zinc-ion batteries.
• MnO2 is also used as a pigment and as a precursor to other manganese compounds, such as potassium permanganate.

Rarity in WikiCards follows a year of Wikipedia page views: the most read articles become Epic and Legendary cards. The Manganese dioxide article was read about 42,000 times in a year. ATK comes from the length of the article and DEF from its quality, so this card hits with 65 and blocks with 54: each hit it takes is cut by 22 %.

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 Manganese dioxide in the power ranking, all domains together.