Heat exchanger, an Uncommon card

The card carries these facts from its Wikipedia article.

• Heat exchangers are used in both cooling and heating processes.
• The fluids may be separated by a solid wall to prevent mixing or they may be in direct contact.
• They are widely used in space heating, refrigeration, air conditioning, power stations, chemical plants, petrochemical plants, petroleum refineries, natural-gas processing, and sewage treatment.

Rarity in WikiCards follows a year of Wikipedia page views: the most read articles become Epic and Legendary cards. The Heat exchanger article was read about 92,000 times in a year. ATK comes from the length of the article and DEF from its quality, so this card hits with 82 and blocks with 68: each hit it takes is cut by 27 %.

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 Heat exchanger in the power ranking, all domains together.