While the second and third abilities of Champions from Beyond have "Party" in their flavor words, neither of them refer to a player's party (a mechanic from previous releases that also uses the term "full party")
Including these two new rarities, the new Rarity levels, in order, are Common, Uncommon, Rare, Super Rare, Legendary, Epic, Enchanted, and Iconic
They are more useful in dedicated Food decks, since there are multiple cards that benefit from sacrificing them to trigger effects
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Given the collectible factor, they tend to be considerably more expensive than traditional versions of the same cards