Deck Master K is the Yu-Gi-Oh! The Duelists of the Roses incarnation of Duel Master K. He is available only in the Custom Duels. He uses the same Deck as the player. If the player defeats him, then they can win copies of the same cards that they have in their own Deck. Deck Master K will also match the same settings as the player, provided they are equal to or above the default settings of a duel. If you lower the Life Points for the custom duel below 4000, Deck Master K will still have 4000 Life Points. Same for setting the summoning level below 3.