The joker is the highest-ranking figure in the hierarchy. It is associated with the number 6 on the numeric die.
At this moment, it exists only as a card, not as a piece.
In most card games, the joker is simply another suit, not a wild card.
In PokerDrez or PokerDrez for 4, the wild card can be used to move any card.
In NeuroDrez, the wild card can be used to move any piece. It is equivalent to the number 6 on the numeric dice.
It will be an ambitious goal to print the wild card as a piece. It would be used only in NeuroDrez. You can introduce this piece onto the board if you have a wild card as a card or roll a 6 on the die. Once on the board, it could move like a queen or a knight. Each player would have a piece of this type.
