Compensation winding, a Common card

The card carries these facts from its Wikipedia article.

• Its purpose is to reduce brush arcing and erosion in DC motors that are operated with weak fields, variable heavy loads or reversing operation such as steel-mill motors.
• When flux from the armature current is about equal to the flux from the field current, the flux at the field pole plate is shifted.
• Under a fixed load, there is an optimal commutation point for the brushes that minimizes arcing and erosion of the brushes.

Rarity in WikiCards follows a year of Wikipedia page views: the most read articles become Epic and Legendary cards. The Compensation winding article was read about 2,000 times in a year. ATK comes from the length of the article and DEF from its quality, so this card hits with 45 and blocks with 23: each hit it takes is cut by 9 %.

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 Compensation winding in the power ranking, all domains together.