Free surface effect, an Uncommon card

The card carries these facts from its Wikipedia article.

• It refers to the tendency of liquids – and of unbound aggregates of small solid objects, like seeds, gravel, or crushed ore, whose behavior approximates that of liquids – to move in response to changes in the attitude of a craft's cargo holds, decks, or liquid tanks in reaction to operator-induced motions.
• When referring to the free surface effect, the condition of a tank that is not full is described as a "slack tank", while a full tank is "pressed up".

Rarity in WikiCards follows a year of Wikipedia page views: the most read articles become Epic and Legendary cards. The Free surface effect article was read about 24,000 times in a year. ATK comes from the length of the article and DEF from its quality, so this card hits with 51 and blocks with 21: each hit it takes is cut by 8 %.

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 Free surface effect in the power ranking, all domains together.