Each owner can play shadow duels by summoning real monsters and add some extra rules like steal memories
Eye : The owner can see his opponent's mind and also takes his soul.
Necklace : Owner can see the future
Puzzle : Owner receive the spirit of the pharaoh who shares the owner's body, he can also inflicts penality games like mind crush.
Ring : Owner receive the spirit of zork and can steal souls and inflicts penality games, he can also transfer one part of his mind to any object.
Rod : Owner can sends souls to shadow Realm and can also control people's mind like puppets
Key : Owner can see the "spirit room" of his "victim"
Scale : Owner can see the victim's true nature.
Subject: Yu-Gi-Oh Anime Class (3/8/13) 
