Mechanic will sell the following items
CardBot: RC to copy over your current deck, when activated with wires, will start a duel with the activator, it will send a pulse through wires touching the top right of it when the activator wins, and the top left of it when the player loses
Dueling Pedestal: when two are actived and connected by wires, and there is 1 player on both pedestals, the players on them will duel

also this is an item not sold:
Rematch Invitation: duel any boss you have defeated in card based combat (not consumable, probably)