In episode 9, Ghost Kaiba uses this card during his Duel against Yami Yugi. After Yami Yugi switches "Dark Magician" to Defense Position and Normal Summons "Curse of Dragon" in Defense Position, Ghost Kaiba activates this card to switch both "Dark Magician" and "Curse of Dragon" to Attack Position, prevent Yami Yugi from summoning any of his monsters in Defense Position, and prevent any monsters Yami Yugi has on his side of the field from switching to Defense Position. In the next episode, this card was still face-up on the field, keeping Yugi's monsters in Attack Position. When Yugi drew "Celtic Guardian" he had the thought of summoning it in Defense Position only to remember that this card won't allow him to do so. This card remained on the field until the Duel was over.
In the second above-mentioned episode, this card appears on Seto Kaiba's computer as soon as he and the computer get inside arena 146 and find out that Yugi is dueling Ghost Kaiba who is using Kaiba's Deck.