In general, I would look at these two factors when looking to include cards not of your tribe's creature type: Is this creature so strong that it, on its own, is generally stronger than my tribal creatures when they are receiving bonuses and/or empowering my other cards
But for some reason, every single Jhoira deck I have ever run up against invariably wants to run mass land removal, and timing crap that breaks the game with Obliterate style effects just before a bunch of big hitters drop from suspension
While Quarter Century Secret Rares will not be duplicated from the core selection, Duelists can expect a mix of classic and brand-new alternate art versions of existing cards
Theoretically, this can be a wonderful gesture of goodwill, giving your opponent something they need or will enjoy
Why Are Yu-Gi-Oh
The most exciting aspect of the Masters Eight is the return of every Regional Champion from Kanto to Galar, some of whom havent been in the spotlight for many years