While "Dark Flare Knight", the first card to ever mention "Flame Swordsman", was released all the way back in Power of the Guardian / Dark Revelation Volume 1 , the first cards with effects that rely on cards that mention "Flame Swordsman" were not released until more than 20 years later in Maze of Millennia
That means no bringing back creatures via spells and traps, no XYZ or Pendulums, and no Synchro summons or summons via card effect
We still know very little about what else will come from this multi-year collaborative endeavor between Wizards and Marvel outside of collectible products and tentpole sets promised in the initial reveal last year
And even if he makes it to the final round, can Yugi possibly face the power of Pegasus Millennium Eye
Leyline of the GuildpactLeyline of the Guildpact (22,245 Inclusions, 16% of 142,434 Decks) While I do love Leyline of the GuildpactLeyline of the Guildpact, it feels like it's most often just an expensive Prismatic OmenPrismatic Omen, Leyline situation excluded, of course