Wild Card (cards) - Wikipedia

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Three of the wild cards in Perlaggen

A wild card is one that may be used to represent any natural card, its holder usually designating its rank and suit. Jokers are frequently used as wild cards, for example in games of the Rummy family. Jokers, however, may also have other uses, such as being a permanent top trump in games like Euchre or 500, the odd one out in Old Maid, or high-value matching cards in Zwicker.

In many games, ordinary cards may be designated as wild, for example, the J♣ and 9♦ in Classic Brag or the "deuces wild" in Poker.[3] A card that is not wild may be referred to as a natural card.[4]

In some cases, the wild card or cards must be agreed upon by players before the cards are dealt and play commences. However, in many games, such as Canasta, Perlaggen or Yellow Dwarf, the wild card or cards are a standard feature of the rules.

In some Austrian and South Tyrolean card games, one or more other cards may be used as wild cards, including the Weli, a special 6 of Bells, the 7 of Bells and 7 of Acorns. In the game of Perlaggen there are six or seven wild cards: four permanent Perlaggs - K or Maxl, 6 or Weli, 7 or Little Weli, the 7 of Bells or Bell-Spitz and 7 or Eichelspitz - as well as 3 "Trump Perlaggs" - the 7, Unter and Ober of Trumps.