His character may not be important enough to warrant it, but this could have been incredibly synergistic in a Standard tokens deck
Because this a Standard set that's built to draft, there does feel like there is overlap in what some of the legends do, but that just means you can personalize your approach
There are many high-level Dinosaur-Type monsters, so the general strategy for them is to Summon their high-Level monsters as quickly as possible using cards like "Hunting Instinct" or "Big Evolution Pill", overpowering the opponent's weaker monsters before they have a chance to defend themselves
Attack!" When Kaiba activates the effect of that monster, he announces "I activate The White Stone of Ancientss effect!" When Kaiba Summons "The White Stone of Legend", he announces "The White Stone of Legend!" Most of the time when Kaiba declares an attack with that monster, he announces "The White Stone of Legend
This extra layer of protection is what makes the ability shine