Antiproton, an Uncommon card

The card carries these facts from its Wikipedia article.

• Antiprotons are stable, but they are typically short-lived, since any collision with a proton will cause both particles to be annihilated in a burst of energy.
• The existence of the antiproton with electric charge of −1 e, opposite to the electric charge of +1 e of the proton, was predicted by Paul Dirac in his 1933 Nobel Prize lecture.
• Dirac received the Nobel Prize for his 1928 publication of his Dirac equation that predicted the existence of positive and negative solutions to Einstein's mass–energy equation and the existence of the positron, the antimatter analog of the electron, with opposite charge and magnetic moment.

Rarity in WikiCards follows a year of Wikipedia page views: the most read articles become Epic and Legendary cards. The Antiproton article was read about 50,000 times in a year. ATK comes from the length of the article and DEF from its quality, so this card hits with 64 and blocks with 41: each hit it takes is cut by 16 %.

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 Antiproton in the power ranking, all domains together.