What other game is comparable to Theatrix but uses playing cards as its randomiser?
Diceless role-playing game A diceless role-playing game is a role-playing game which is not based on chance: it does not use randomisers to determine the outcome of events in its role-playing game system. The style of game is known as "diceless" because most games use dice as their randomiser; some games such as "Castle Falkenstein" use other randomisers such as playing cards as substitutes for dice, and are not considered "diceless".
Imaginary Thirteen Imaginary Thirteen is a solitaire card game which is played with two decks of playing cards. Its gameplay makes it a two-deck version of Calculation and its name is taken from the fact that when a sum is over thirteen, thirteen (from out of nowhere) is subtracted to get the value of the next card, with spot cards worth their face value, jacks eleven, queens twelve, and kings thirteen.