yugioh melodious diva deck YU-GI-OH! - Sonata The (DUEA-EN015) - Duelist Alliance - 1st Edition Melodious - Yugipedia

UR Ultra Rare Secret Six Samurai - Fuma X WIND Level 1 [ WarriorTunerEffect ] ATK 200 DEF 1800 If this card is destroyed by battle or card effect: You can Special Summon 1 "Six Samurai" monster from your Deck, except "Secret Six Samurai - Fuma"

Shiranui Squiresaga X FIRE Level 7 [ Zombie / SynchroEffect ] ATK 2100 DEF 0 1 Tuner + 1+ non-Tuner monsters You can only Special Summon "Shiranui Squiresaga(s)" once per turn

anime, the crew wanted to make sure of two things - the content was canon and the cards were absolutely not real

Its also fairly easy to get Promethean Princess out of the Graveyard and theres a lot of support from other archetypes for players who do want to build this card into existing decks