Playing Cards

Two distinct types of playing cards, which may both belong to the same deck, have been featured in the pages of Girl Genius.

Moxana's "Tarot"
The Muse Moxana has been shown using a set of cards which are reminiscent of the Trumps or Major Arcana of the Tarot deck, but which are mechanical in theme, for divination and communication.

Card XXI, "The Device" is by Moxana to indicate that she wishes Agatha to attempt to repair her. (number unknown), "The Whirlwind" is to Tarvek by Moxana, who notes that it has multiple meanings.

Ordinary Playing Cards
Master Payne is shown a card game, possibly Poker or a game closely similar to it, with a soldier. It appears that Sparks and Muses are types of court cards in the game, and also, from the artwork, that the cards have the same French suits as are commonly used in the English-speaking world, as opposed to the Italian suits commonly seen with Tarot cards, or the German suits that are common in Central Europe.