Probably the best bet for white is the Forces of the Imperium Commander Deck, and as usual the vast armies of the Imperium act as cannon fodder for the Emperor
Original prints of this card arent necessarily worth a fortune, but you could see this one taking a positive trend on the secondary card market when the set releases its (officially confirmed) reprint
Not all rare cards are expensive
Unlike the other characters, who actually just want to have fun while playing games but end up getting roped into life-or-death situations against their will, Kaiba was taught from a very young age that losing a game may as well be equal to death itself, hence the idea behind the DEATH-T amusement park and while he gets somewhat better, later on, he still takes Duel Monsters very seriously and is more than willing to accept life-or-death stakes when it comes to duels
If those fail, there's always Syr Konrad the Grim
Quattro then disappeared through a portal, adding that Shark should tell his father that his sons will wait for him