The Master of Magicians: Part 1 - S2-E11
Continuity mistake: On Arkana's first turn, the Dark Magician card can be seen as one of the cards in his hand. The card next to Dark Magician appears to be a monster card where an axe is featured in the artwork. Over a minute later, when Arkana realises he'll have to discard the cards in his hand, the monster card next to Dark Magician has been replaced with a different monster card (possibly Alligator Sword, a card used by Joey in the previous episode). (00:16:26 - 00:17:49)