Katsuya began illustrating Duel Masters cards for Wizards of the Coast during production of the Base Set, for which Katsuya illustrated Gigaberos, Onslaughter Triceps, "Skeleton Soldier, the Defiled," and Steel Smasher.
You can look up Gigaberos, Onslaughter Triceps, Skeleton Soldier, the Defiled, and Steel Smasher, along with every other Duel Masters card printed in English, in the Duel Masters card database, here: http://www.wizards.com/duelmasters/dmdb.asp Note that the database does not show promotional cards.