Tubercle effect, a Common card

The card carries these facts from its Wikipedia article.

• The tubercle effect works by channeling flow over the airfoil into more narrow streams, creating higher velocities.
• Another side effect of these channels is the reduction of flow moving over the wingtip and resulting in less induced drag due to wingtip vortices.
• Using computational modeling, it was determined that the presence of tubercles produces a delay in the angle of attack until stall, thereby increasing maximum lift and decreasing drag.

Rarity in WikiCards follows a year of Wikipedia page views: the most read articles become Epic and Legendary cards. The Tubercle effect article was read about 6,400 times in a year. ATK comes from the length of the article and DEF from its quality, so this card hits with 58 and blocks with 43: each hit it takes is cut by 17 %.

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 Tubercle effect in the power ranking, all domains together.