Card Appearances:Schrödinger's Cat
- In episode 96, Dr. Eisenstein uses this card during his Duel against Jaden Yuki. After Eisenstein activates this card, he activates "Pot of Greed" to draw two cards. Eisenstein then uses this card's effect to shuffle the two cards he just drew back to his Deck and draw two new cards. Later Eisenstein banishes this card, "Laplace the Fiend Mathematician", and "Draw Paradox" in order to activate "Battle Constant".
- In episode 120, this card is shown in a flashback Bastion Misawa has when he explains that after seeing Jaden Duel Eisenstein, he went on to study the field of quantum mechanics with Eisenstein.