As the term suggests, the rarities each signify different percentages for how easy or difficult it will be to find one of these types in the booster packs of cards for the game
7 Absorbing Jar Exchanges Back Row Cards for Card Advantage Galactic Overlord May 8, 2012 Absorbing Jar may seem like an inferior Harpie's Feather Duster on the surface, but there exists a niche use for its effect destroying one's own Artifact or Toy cards to set off their effects and gain hand advantage
Never running out of cards is an ability normally reserved for hard control decks running 8+ dedicated draw spells and relying on a multitude of answers to get to that point
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It consists mostly of DARK Fiend monsters, and while not seen at length, it appears to have several control elements to it, "Chthonian Polymer" and "Chthonian Soldier" turning an opponent's powerful monsters against them, and "Mefist the Infernal General" and "Helpoemer" discarding cards from the opponent's hand