Second derivative, an Uncommon card

The card carries these facts from its Wikipedia article.

• Informally, the second derivative can be phrased as "the rate of change of the rate of change", for example, the second derivative of the position of an object with respect to time is the instantaneous acceleration of the object, or the rate at which the velocity of the object is changing with respect to time.
• In Leibniz notation: a = d v d t = d 2 x d t 2, where a is acceleration, v is velocity, t is time, x is position, and d is the instantaneous "delta" or change.
• The last expression d 2 x d t 2 is the second derivative of position with respect to time.

Rarity in WikiCards follows a year of Wikipedia page views: the most read articles become Epic and Legendary cards. The Second derivative article was read about 39,000 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 34: each hit it takes is cut by 14 %.

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 Second derivative in the power ranking, all domains together.